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Const throw ReferenceError when accessing a variable before it's declared 3. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? Did the apostolic or early church fathers acknowledge Papal infallibility? Agree var is function scoped when it is declared within a function. The scope is global when a var variable is declared outside a function. However discussion as noted here seems to indicate a real potential for performance differences under certain scenarios: https://esdiscuss.org/topic/performance-concern-with-let-const. Before We End. When using let, you don't have to bother if you have used a name for a variable before as a variable exists only within its scope. Just let me mention that I started from the code of AMN and did lots of tweaking, and editing. (Repeated tests in both browsers have one winning, or the other winning, and in both cases within a margin of error.) Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. It can be updated but cannot be re-declared into the scope. So with const o = {}, you could change the state of the object (o.answer = 42), but you can't make o point to a new object (because that would require changing the object reference it contains). Anything within curly braces is a block. By using this website, you agree with our Cookies Policy. Connect and share knowledge within a single location that is structured and easy to search. Is there a different reason to use const? Yes, the bug can be found in testing. Let's put those CSS skills to work! 'let' is made to make code more readable, not more powerful, by practice the compiler can not solve completely (static analysis) an uncompleted program so sometime it will miss the optimization, in any-case using 'let' will require more CPU for introspection, the bench must be started when google v8 starts to parse, if introspection fails 'let' will push hard on the V8 garbage collector, it will require more iteration to free/reuse. This is because let variables are block scoped . Yes, it does signal to the reader that you're not going to assign to the variable. How is the merkle root verified if the mempools may be different? So while this will work: However, if the same variable is defined in different scopes, there will be no error: Why is there no error? var is scoped to the nearest function block and let is scoped to the nearest enclosing block, which can be smaller than a function block. Const and let were introduced in ES2015 to declare block scoped variables. (Even before then, odds are your loop was doing enough work that the additional let-related overhead was washed out anyway. A block is a chunk of code bounded by {}. (Heck, linters have rules to detect this and suggest using const instead of let.). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. code with 'let' will be more optimized than 'var' as variables declared with var do not get cleared when the scope expires but variables declared with let does. In practice, here in 2018, modern JavaScript engines do enough introspection of the loop to know when it can optimize that difference away. As to the argument that we lose the ability to communicate whether it was important for something to not be reassigned, I use the old convention of making those type of constants declared with all UPPERCASE. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The first, const, is initialized during compile-time and the latter, readonly, initialized is by the latest run-time. But now you don't even have to worry about it.). You can make a tax-deductible donation here. Unlike var which is initialized as undefined, the let keyword is not initialized. This is because both instances are treated as different variables since they have different scopes. What is the difference between const int*, const int * const, and int const *? There was a BIG difference when all tests where separated in individual functions, execution speed was at-least doubled and 1st test's delay almost vanished! let should be used when the value is to be overwritten/changed later, and both should be used when you need a block scoped variable, and not a variable scoped to a function. use var, if you want to be compatible with ES5 implementations or if you want module/function level scope. I've been applying this rule: If possible, use const. Over time, JavaScript applications have grown in complexity. As of ES6, there's been a more consistent approach for creating variables using let and const. We had var, and while that still works like it always has, it is generally said that let and const are replacements to the point we rarely (if ever) need var anymore. We had var, and while that still works like it always has, it is generally said that let and const are replacements to the point we rarely (if ever) need var anymore. This means that we can only use it in the code block where we declare them. How to check whether a string contains a substring in JavaScript? 1.6K Followers. 1. var is function-scoped 2. var return undefined when accessing a variable before it's declared let: - 1. let is block-scoped 2. let throw ReferenceError when accessing a variable before it's declared const:- 1. I found that loop time with let is better. 14 14 ! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. We now know that var is function scope, and now we know that let and const are block scope, which means any time you've got a set of curly brackets you have block scope. Find centralized, trusted content and collaborate around the technologies you use most. Variables declared with the const maintain constant values. Should I use const or let? What does "use strict" do in JavaScript, and what is the reasoning behind it? The first difference is the timeslot which initializes the const or readonly variables. Reply. With const, though, you're explicitly telling the engine that the value cannot change. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? I give the code used below. Using let or const you can have multiple variables with the same name in their own scopes. When using let or const in other var-like situations, they're not likely to have different performance. That is why it was necessary for new ways to declare variables to emerge. But the difference only matters if you create a function (closure) within the loop that uses i, as I did in that runnable snippet example above. In this tutorial we will discuss about const vs let performance. Use let when you need to reassign another value to a variable. There are situations where you have to use let, like when you need to redeclare the variable since const doesnt let you do that. The main reason for this rule is it's easy to apply consistently. I understand let/const is a feature that came with ES6, but are people actually using it? const: the value of a const are assigned at compile time itself and once assigned, cannot be changed. Obviously, a const cannot be changed (it is immutable). Here in 2018, it looks like V8 (and SpiderMonkey in Firefox) is doing sufficient introspection that there's no performance cost in a loop that doesn't make use of let's variable-per-iteration semantics. Let vs Const vs Var: We generally want to use let. Do javascript engines optimize constants defined within closures? Our mission: to help people learn to code for free. A passionate software engineer and Angular GDE. Let's deep dive into a quick comparison between let vs. var vs. const keywords and derive some best practices of declaring a javascript variable based on their individual properties. (Also, a comment could be wrong but const won't let you be wrong.) Ideally, we could get a C++ project (let say minimum 10k LOC) and then use const whenever possible, and compare it against the same project without const. The differences between var and let/const are: var declarations are globally scoped or function scoped while let and const are block-scoped. But again, it's a synthetic benchmark, not your code. I also found this question on SO, but it talks more about what let and const do, not so much why one is better than the other. Find centralized, trusted content and collaborate around the technologies you use most. It also solves the problem with var that we just covered. var variables can be updated and re-declared within its scope; let variables can be updated but not re-declared; const variables can neither be updated nor re-declared. The second difference is that readonly can only be initialized at the class-level. The way I think about it, is that a const should be used if the value is to never be changed, or more importantly protected from change. As of Mid-2018, the versions with let and var have the same speed in Chrome, so now there is no difference anymore. If we're not using the same, we use const. Here is an addition of: "When would I get the most bang for my buck on editing existing var declarations to const ?". And then? We also code in Scala and there use use "val" whenever we can, and we use "var" only when the variable in being changed. To learn more, see our tips on writing great answers. The only difference between these two is that variables declared using let can be reassigned, whereas variables declared using const cannot: let artistName = 'Prince'; artistName = 'The Artist Formerly Known As Prince'; // All fine const immutableArtistName = 'Prince'; immutableArtistName = 'TAFKAP'; // TypeError: Assignment to constant variable By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. There are no grey areas. They are static in nature and we cannot use the static keyword with them. the var declaration is hoisted so it can't know that. Affordable solution to train a team and make them project ready. The code above is fairly simple but imagine a more complicated algorithm that uses more variables. Please don't judge the code, I did try but don't pretend to be any expert in JS. Use let only when you need block level scoping, otherwise using let or var would not make any difference. The other thing we need to know about it is that the difference between let and const is that const variables cannot be updated. Originally sourced from. const: let: Fastest: N/A Only use let if you know its value needs to change. We also have thousands of freeCodeCamp study groups around the world. Did the apostolic or early church fathers acknowledge Papal infallibility? Claim $50 in free hosting credit on Cloudways with code CSSTRICKS. Sed based on 2 words, then replace whole line with variable. In TypeScript, when do you use "let" and when do you use "const"? Your loops as they are I get 1ms/0.4ms, however if for both I have a variable j (var or let) outside the loop which is also incremented, I then get 1ms/1.5ms. A block lives in curly braces. Real loops don't have empty bodies. This function should have exactly the same performance whether you use var or let, for instance: function foo () { var i = 0; while (Math.random () < 0.5) { ++i; } return i; } They are all hoisted to the top of their scope. A lot of shiny new features came out with ES2015 (ES6). We default to "const" at work, and use "let" only when the variable will be changed later in the function. I found the mean speeds are. This behavior is somehow different when it comes to objects declared with const. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Anyway, to use let where you don't have to, makes your code less readable. In theory, an unoptimized version of this loop: might be slower than an unoptimized version of the same loop with var: because a different i variable is created for each loop iteration with let, whereas there's only one i with var. Kusaddaw 5 yr. ago. If you have used greeter in other parts of your code, you might be surprised at the output you might get. In a synthetic, small examples like: string str; str = "Hello World"; vs. const string str = "Hello World"; There can be a performance increase of . Let's try to evaluate that difference. In this article, we'll discuss var, let and const with respect to their scope, use, and hoisting. let variables are made to be updated. 4 yr. ago it's not, the first test you run always executes the fastest for whatever reason. There are multiple ways to declare variables in JavaScript. Both are global if outside any block. But does that mean you should use const in every single situation where you dont? Arguing against that is the fact the var is hoisted so it's declared outside the loop whereas the let is only declared within the loop, which may offer an optimization advantage. Add a new light switch in line with another switch? What is the difference between "let" and "var"? https://esdiscuss.org/topic/performance-concern-with-let-const. A code analyzer could just as well determine that a variable declared with let is not ever reassigned and optimize it the same as if you had declared it with const. Let's see with example. There are multiple ways to declare variables in JavaScript. Use const more often. var vs let vs const. Until ES2015, var was the only construct available for defining variables. Is there a verb meaning depthify (getting more depth)? What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked, MOSFET is getting very hot at high frequency PWM. Just like let, const declarations are hoisted to the top but are not initialized. Apart from declaring a variable using the var keyword, ECMAScript 6 enabled developers to create variables using the let and the const keywords. The scope of a var variable is functional scope. freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Yes, it does signal to the reader that you're not going to assign to the variable. Dan Abramov covers the controversy. const declarations share some similarities with let declarations. The argument that prefers const when possible: One Way to Do It: It is mental overhead to have to choose between let and const every time. Before the advent of ES6, var declarations ruled. Thanks for contributing an answer to Stack Overflow! It can be updated and re-declared into the scope. What is up for debate is the general coding style of when you should pick one or the other. Why is apparent power not measured in Watts? Following is the code showing let and const in JavaScript Example Live Demo I love to learn, help & share . This means that we can do this within the same scope and won't get an error. As a native speaker why is this usage of I've so awkward? Is this an at-all realistic configuration for a DHC-2 Beaver? And do var, let, const also affect performance? Although using const to define functions seems like a hack, it comes with some great advantages that make it superior (in my opinion) It makes the function immutable, so you don't have to worry about that function being changed by some other piece of code. (I've have seen codebases which force you to use const when there is only . The benefit of const, over putting a comment saying the same thing, is mainly that const is a standard way of signalling it. The difference is scoping. This will likely cause a lot of bugs in your code. Are there conservative socialists in the US? Asking for help, clarification, or responding to other answers. Not the answer you're looking for? But while. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Unlike var, a let variable cannot be re-declared within its scope. Ready to optimize your JavaScript with Rust? How do I remove a property from a JavaScript object? Just to make the usual point that performance testing is hard in the presence of optimisers: I think the let loop is being optimised away entirely - let only exists inside the block and the loop has no side effect and V8 is smart enough to know it can just remove the block, then the loop. To learn more, see our tips on writing great answers. What are the advantages of reassigning constants inside of JavaScript for loops? rev2022.12.9.43105. Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? @sean2078 - if you need to declare a variable that only lives in a block scope, I'm confused by how the quoted code is meant to demonstrate any difference between, Currently is does not - only const vs. var .. It cannot be updated or re-declared. So if you declare a variable with var that you never intend to change (and never do change in your code), the engine can't assume it's never going to change as the result of code loaded later or similar. And now, since it's 2020, it's assumed that a lot of JavaScript developers have become familiar with and have started using these features. So if you try to use a let variable before declaration, you'll get a Reference Error. How do I replace all occurrences of a string in JavaScript? Beware synthetic benchmarks as they are extremely easy to get wrong, and trigger JavaScript engine optimizers in ways that real code doesn't (both good and bad ways). They are scoped to the block in which they are declared i.e. Also, since a variable cannot be declared more than once within a scope, then the problem discussed earlier that occurs with var does not happen. Are any difference between using declaration sign (var/let/const) to define arrow function v.s. How to use a VPN to access a Russian website that is banned in the EU? It seems that netizens believe that one should use const wherever possible, only falling back to let where necessary, as can be enforced with the prefer-const ESLint rule. It does say to use const as much as possible, but what benefit does that provide? It is being instilled into us to be using let/const instead of var for all variable declarations. Are variables declared with let or const hoisted? As a style matter, I prefer let for the scoping benefit and the closure-in-loops benefit if I use the loop variable in a closure. 2. This means that if we do this: So var variables are hoisted to the top of their scope and initialized with a value of undefined. I am a software engineer that is interested in making the web accessible for all. With a simple test (5 times) in navigator like that: The mean time to execute is more than 2.5ms, The mean time to execute is more than 1.5ms. not, javascript memory management of let vs var vs const, Is there a performance difference between 'let' and 'var' in JavaScript. They are all hoisted to the top of their scope. Appropriate translation of "puer territus pedes nudos aspicit"? Is there any reason on passenger airliners not to have a physical lock between throttles? Connect and share knowledge within a single location that is structured and easy to search. Something can be done or not a fit? Difference between var and let in JavaScript, Difference between const char* p, char * const p, and const char * const p in C. What is the difference between const int*, const int * const, and int const *? Learn more, Difference between const int*, const int * const, and int const * in C, Difference Between Static and Const in JavaScript. But why wait for testing? Find more about me here: www.fatimaamzil.com. vs. const MyComponent = () => {} export default MyComponent The function syntax gives us the ability to export default the component in place. Tests: const. Use let or const. Worry about the performance of your code when and if your code has a performance problem. Better way to check if an element only exists in one array, Understanding The Fundamental Theorem of Calculus, Part 2. Its a very well articulated point and counterpoint of both sides with literal lists that compare the two. `const` is a signal that the identifier won't be reassigned. (any Dude where's my car fans here?) My results initially showed that between Const / Let / Var there was a ratio from 4 / 4 / 1 to 3 / 3 / 1 in execution time. it will also consume more RAM. forof loop. What's the fastest way to create an Array from another Array in App Scripts? I would be delighted to see your tests and opinions. It seemed for me that it wasn't measurably faster, but the overall memory consumption was reduced by about 1-3% for my grossly monolithic Frankenstein-ed app. What is the difference between "let" and "var"? We accomplish this by creating thousands of videos, articles, and interactive coding lessons - all freely available to the public. :-), Running this in Firefox 65.0, I got mean speeds of, I just trialed this in Node v12.5. Also, variables declared with let are not accessible before they are declared in their enclosing block. Should I give a brutally honest feedback on course evaluations? The scope of a const variable is block scope. Don't try to access a variable without declaring it. How to merge two arrays in JavaScript and de-duplicate items. Are there any performance advantages to using "const" instead of "let" or "var" in JavaScript? What does "use strict" do in JavaScript, and what is the reasoning behind it? I'll use the example below to explain: So, since times > 3 returns true, greeter is redefined to "say Hello instead". Get started with $200 in free credit! Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. While a const object cannot be updated, the properties of this objects can be updated. While variables declared using let can be reassigned, they cannot be reassigned if they were declared using const. There's a weakness that comes with var. Therefore, if we declare a const object as this: This will update the value of greeting.message without returning errors. Does "undefined" occupy memory in javascript? Are there breakers which can be triggered by an external signal and have to be reset by hand? Const and let were introduced in ES2015 to declare block scoped variables. Scope essentially means where these variables are available for use. Also by declaring a variable const it means you have thought up front that you don't plan to reassign it, which in turn can protect you from accidental bugs or errors. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Why do American universities have so many gen-eds? `let` is a signal that the variable may be reassigned , such as a counter in a loop, or a value swap in an algorithm. Or in any case? let vs. const. DigitalOcean provides cloud products for every stage of your journey. Allow non-GPL plugins in a GPL main program. Are defenders behind an arrow slit attackable? var declarations are globally scoped or function/locally scoped. Asking for help, clarification, or responding to other answers. While this assumption might be partially true, it's still possible that some of these features remain a mystery to some devs. Does storing in variables increase performance? I've found that the most performance boost had to do with "exported" functions. How can I validate an email address in JavaScript? With const, you can not re-assign a value to the variable. However, if you want a synthetic benchmark, here's one: It says that there's no significant difference in that synthetic test on either V8/Chrome or SpiderMonkey/Firefox. I love sharing knowledge so I write about things I learn and things I need to learn. How to print and pipe log file at the same time? i.e. Consider the following code: In this code, I typed tree = child when I meant to type found = child. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Why is the federal judiciary of the United States divided into circuits? I may say: const key = 'abc123'; let points = 50; let winner = false; points = 60; ..and that will work just fine. let & const is block scoped The variables declared using let or const are block-scoped. What is the difference between const and readonly in C#? Penrose diagram of hypothetical astrophysical white hole. Thanks for the answer - I agree, so for myself have standardized on using var for looping operations as noted in your 1st for loop example, and let / const for all other declarations assuming that the performance difference is essentially nonexistent as the performance test would seem to indicate for now. const vs let So if only const and let are primarily used in JS, because of the hoisting and scoping issues of variables declared with var, what's the major difference between const and let then? Difference between const int*, const int * const, and int const * in C/C++? The "principle of least privilege" is often invoked in conjunction with const, but why should I care about the least privilege? With let, you can. A code analyzer could just as well determine that a variable declared with let is not ever reassigned and optimize it the same as if you had declared it with const. Following is the code showing let and const in JavaScript , The above code will produce the following output , Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. That is, unless someone else can show a discernible difference via code example. How to use 'const' keyword in JavaScript? Making statements based on opinion; back them up with references or personal experience. Add a new light switch in line with another switch? I love Dans conclusion: I dont care. This is something that can be linted and auto-fixed. Here, greeter is globally scoped because it exists outside a function while hello is function scoped. The rubber protection cover does not pass through the hole in the rim. So just in case you missed the differences, here they are: Got any question or additions? The scope of a let variable is block scope. var declarations are globally scoped or function scoped while let and const are block scoped. It's no surprise as it comes as an improvement to var declarations. This means that the value of a variable declared with const remains the same within its scope. 1980s short story - disease of self absorption. So a variable declared in a block with let is only available for use within that block. Those type of constants are usually declared separate from my functions. When you have a variable which can be declared as const, and you declare it as such you inform the reader that you don't plan to reassign it to a different value later on. let Rendered benchmark preparation results: Suite status: <idle, ready to run> Run tests (2) Previous results Fork . After Edit in 29/01/2022 (according to jmrk's remark to remove global variables in let and const tests) now results seem similar 1 / 1 / 1. We make use of First and third party cookies to improve our user experience. Just like var, let declarations are hoisted to the top. I don't think this is the main benefit though. I did the tests both in w3schools_tryit editor and in Google_scripts. But why is ReSharper is encouraging me to change as many lets to const as I can? This turned out to be very controversial, sparking conversations on Twitter and Reddit. use let if you want the exact opposite of const. use const whenever you want some variables not to be modified. The question is, what makes them different from good ol' var which we've been using? Because it helps with early detection of coding mistakes. let vs const vs var: Usually you want let.If you want to forbid assignment to this variable, you can use const. Which equals operator (== vs ===) should be used in JavaScript comparisons? Perhaps later, optimizations on const will be added. Is there a speed difference between const and let? v8 JavaScript performance implications of const, let, and var? Window.onload vs onDocumentReady in javascript. I prefer const as the default, and change to let only if needed. Remember that with objects, the value is a reference to the object, not the object itself. Allow non-GPL plugins in a GPL main program, What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. React 15 Scheduler getCurrentTime Scheduler getCurrentTime let getCurrentTime; const hasPerf so var uses more space as it makes different versions when used in a loop. It's my first week learning JS in my coding boot camp. Tweet a thanks, Learn to code for free. So if file A, B, R, and Z are calling on a "utility" function in file U that is commonly used through your app, then switching that utility function over to "const" and the parent file reference to a const can eak out some improved performance. @KaneHooper - If you got a fivefold difference in Firefox, it'll have to have been the empty loop body that did it. Which if you're spending bags of cash on the cloud or your baremetal server, could be a good reason to spend 30 minutes to comb through and update some of those var declarations to const. The effect of the performance gape between var and let can be seen in real-life complete program and not on a single basic loop. This fact makes let a better choice than var. It's hard to show the real numbers here. Being standard, it transmits the information more readily than custom comments. This doodle explanation does a pretty good job, if you need a refresher. If I had marked it const then I would have immediately learned the error because the compiler would informed me of it. For example: But ultimately, I dont think its that important. Hoisting Turns out the biggest reason (as what I could find) is due to hoisting. As you read, take note of the differences between them that I'll point out. This means that it is available and can be accessed only within that function. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. There are issues associated with variables declared with var, though. we have too much theory in the fantastic previous answers, time for testing here We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It cannot be updated or re-declared into the scope. Using a different keyword like let or const still instantiates a new variable in JavaScript's execution context in much the same way that var does (and thus const could be compiled with Babel). The important difference between var and let in a for loop is that a different i is created for each iteration; it addresses the classic "closures in loop" problem: Creating the new EnvironmentRecord for each loop body (spec link) is work, and work takes time, which is why in theory the let version is slower than the var version. While variables declared using let can be reassigned, they cannot be reassigned if they were declared using const. Solution 2 I realize that if you read into how const, var, and let work under the covers you probably already concluded the above but in case you "glanced" over it :D. From what I remember of the benchmarking on node v8.12.0 when I was making the update, my app went from idle consumption of ~240MB RAM to ~233MB RAM. Please let me know. All five points on both sides are worth a read. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? Just did some more tests, Initially I concluded that there is a substantial difference in favor of var. Get started, freeCodeCamp is a donor-supported tax-exempt 501(c)(3) nonprofit organization (United States Federal Tax Identification Number: 82-0779546). If you have important information to share, please. First, let's get to understand var more before we discuss those issues. My previous post included this paragraph:. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Take the following example: Previously, I had let id and let value but ReSharper asked me to change them to const, which works, but why is it better in this case? Donations to freeCodeCamp go toward our education initiatives, and help pay for servers, services, and staff. I would not have to wait for testing. The argument that prefers let when possible: Loss of Intent: If we force const everywhere it can work, we lose the ability to communicate whether it was important for something to not be reassigned. To understand further, look at the example below. Let me explain this with an example: We see that using hello outside its block (the curly braces where it was defined) returns an error. (You can always go back and change a const to a let if it later turns out you need to change its value.) What are the criteria for a protest to be a strong incentivizing factor for policy change in China? If you read this far, tweet to the author to show them you care. See this test. A rule like always use const where it works lets you stop thinking about it and can be enforced by a linter. That's the story behind let . Map - constant switch - inlined values Initial findings (on my machine, feel free to try it out for yourself): Chrome v77: (4) is by far the fastest, followed by (2) Safari v12.1: (4) is slightly faster than (2), lowest performance across browsers Firefox v69: (5) is the fastest, with (3) slightly behind javascript performance optimization v8 Share In GoogleScripts there seems that the 1st test ALWAYS takes longer, no-matter which one, especially for reps<5.000.000 and before separating them in individual functions, For Reps < 5.000.000 JS engine optimizations are all that matters, results go up and down without safe conclusions, GoogleScripts constantly does ~1.5x time longer, I think it is expected. the bench must take these points into account. Just like var, a variable declared with let can be updated within its scope. since in this respect IMO there is no difference between TS and JS, I will add JS tag too. inside the if/try/catch/while/for or any code block (enclosed in curly parentheses). Const cannot be reassigned Since both are block-scoped and not hoisted, the only differences are that a variable declared with const cannot be re-assigned Otherwise, the distinction can't be observed and can be optimized away. 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