index.ts. How about this one: The accepted answer is actually not answering the question since it was asked for a generic way. . Whenever we declare a variable without initializing it with a value, TypeScript initializes it as undefined. This article will try to make it simple to understand. After learning more about how TypeError in JavaScript happens, you will move to learn how to solve the Error: TypeError: Cannot convert undefined or null to object In JavaScript. Its like void in that its useful for designating that a function never returns anything. The third line would get us Argument of type false is not assignable to parameter of type object | null, and the last line would get us Argument of type undefined is not assignable to parameter of type object | null. Why is null an object and what's the difference between null and undefined? Connect and share knowledge within a single location that is structured and easy to search. So, if we have the following code in our TypeScript files, then they would be compiled and run: We would get an empty object in both console.log statements. This gives us a type of (Product | undefined) [] (an array of Product | undefined objects). My thought is that I'll probably need to recursively check each property to see if it itself is an object with sub properties, and I'll also need to iterate any arrays found that might have a null value as well, or have an object that will need to be recursively checked as well. typescript default value null or undefined. JavaScript, like any other programming language, has its own data structures and types. You can also use the logical OR (||) operator to provide a default value if a variable . The line if (obj === 'null') { return null;} // null unchanged will not Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Also, we can use it to prevent primitive values from being assigned to it. This error occurs when you try to operate a function with the parameter is null or undefined. What happens if you score more than 99 points in volleyball? Example So, the variable of the void type can only have the value null if the --strictNullChecks setting isnt specified when running the TypeScrip compiler or it can be set to undefined. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Check if a value is an object in JavaScript, typescript how to transfrom undefined property to optional property. LearnshareIT A bit late to the party, but I think Grant's answer can be simplified a bit. The compiler will not throw any error. The objects can be complex, contain arrays of other objects, or have nested objects. Save my name, email, and website in this browser for the next time I comment. Hi, my name is Thomas Valen. How to change background color of Stepper widget to transparent color? I want to write a function that will convert any instance of null to undefined in any object i pass to it. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Making statements based on opinion; back them up with references or personal experience. You can initialize destination object with empty object like below: Adding "Object &&" works before putting the object on to map. When is null or undefined used in JavaScript? Object is possibly 'null' or 'undefined'. . This is very useful to avoid errors when accessing properties of null or undefined objects. on TypeScript Data Types Null, Void, Undefined, Never and Object, TypeScript Data Types Numbers, Strings, and Objects, Node.jss fs Module: Writing Files and Directories. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? It's mainly used in the type definition of the Object object in the standard library and other pieces of code that don't want primitive values to be assigned to it, or passed into a function. It means that a variable has been declared but has not yet been assigned a value. JavaScript is a loosely typed, or dynamically typed, language. Do non-Segwit nodes reject Segwit transactions with invalid signature? Save my name, email, and website in this browser for the next time I comment. Is there a higher analog of "category with all same side inverses is a groupoid"? is developed to help students learn and share their knowledge more effectively. JavaScript (and by extension TypeScript) has two bottom types : null and undefined. A function that has the void return type doesnt return anything. What is the difference between null and undefined in JavaScript? export type Maybe<T extends {}> = T | null | undefined; type tests = [ // @ts-expect-error May All we have to do to enable this behavior is to set "strictNullChecks": true (or rely on it being set via the umbrella "strict": true flag) in our tsconfig.json compilerOptions. CGAC2022 Day 10: Help Santa sort presents! Teams. typeerror: cannot convert undefined or null to object typescript. Compilation would fail and the code wouldnt run. Typescript - What is the difference between null and undefined? I am a software developer, so I have much experience in programming languages. Central limit theorem replacing radical n with n, Name of a play about the morality of prostitution (kind of). However, if we write the following instead: Then we get Type 1 is not assignable to type object and the code cant be compiled with the TypeScript compiler and be run, since 1 is a primitive value. Use the !! An easy way to visualize this is to use the operators to compare undefined and null. Your email address will not be published. How to resolve TypeError: Cannot convert undefined or null to object; How to resolve TypeError: Cannot convert undefined or null to object But I'm getting this error in a spec runner designed to test this. For example, we can write a function that has an infinite loop that has the never return type like in the following code: A function that throws an exception may also have the never return type, like in the following example: The object type is a type that represents non-primitive objects. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. @MikeMcCaughan sorry i tried to provide enough information to make the problem understandable, but i think it had the opposite effect. TypeScript strictNullChecks strictNullChecks off null undefined never The issue was that I had an old .npmrc that pointed to an the npm registry using skimdb.npmjs.org. Your email address will not be published. What you CAN do is to check if a value is not truthy (aka falsey) and then do some sort of logic. Follow. In my case, I added Lucid extension to Chrome and didn't notice the problem at that moment. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Web developer specializing in React, Vue, and front end development. Is there a way around this? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. in TypeScript. However, it doesn't work as expected. Is it appropriate to ignore emails from a student asking obvious questions? Should I give a brutally honest feedback on course evaluations? Are you just trying to iterate over an object's properties? Have an exciting learning experience. Not the answer you're looking for? an expression evaluated to false for the below values Is there any chance you could expand your code with a simple example? Disconnect vertical tab connector from PCB, Received a 'behavior reminder' from manager. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. when we convert undefined to number it becomes NaN. How to resolve TypeError: Cannot convert undefined or null to object. This feature is called "Non-null assertion operator", basically it means that when you add the exclamation mark after a property/value, you are telling TypeScript that you are certain that value is not null or undefined. Types null and undefined are primitive types and can be used like other types, such as string. Use the nullish coalescing operator (??) In example 1, we intentionally defined myNum with number, null, or undefined. BeITService | Best theme for IT services. The question clearly states: I'm not quite sure i understand what this does? We have not given it any initial value. To make a variable null we must assign null value to it as by default in typescript unassigned values are termed undefined. Dynamically setting a nested value, https://github.com/apollographql/apollo-client/issues/2412#issuecomment-755449680. how tall was harry chapin Try accounting for the fact that the input parameter for the transform method can also be null or undefined: @Pipe ( { name: 'valueArray', }) export class ValueArrayPipe implements PipeTransform { transform (objects: any = []): any { if (!objects) { return null; // or [], or undefined } return Object.values (objects); } } Share class Example { doSomething(): void { const username = 'David' as string | undefined; // add ! My first thought when approaching the problem is to use generics to attempt to catch the type of each of the properties with a generic type and then to convert the value of that property from null to undefined as needed. stringifyJSON(null) for example. Choose the solution that is the most suitable for you. 1980s short story - disease of self absorption. whenever we do not explicitly assign a value to a variable, TypeScript assigns the undefined value to it. How do I correctly clone a JavaScript object? Asking for help, clarification, or responding to other answers. Then, we can specify something useful along with the undefined type. i.e. Why does the USA not have a constitutional court? boolean | undefined | null (or prop . Is there a standard function to check for null, undefined, or blank variables in JavaScript? Programming Languages: C, C++, Java, Python, JavaScript, R, To solve the error TypeError: map.get is not a function in JavaScript easily, we must [], After understanding the root cause of the error TypeError: date.getHours is not a function in [], After doing some research, we also found a way to guide you to check if [], Your email address will not be published. is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand. The following example declares the variable foo. A function that has a never return type must always have an unreachable endpoint. This error is caused when you call a function that expects an Object as its argument, but pass undefined or null instead, like for example. Here is one that is similar and will also cast the return type properly: Credits go to the typings of this genius: https://github.com/apollographql/apollo-client/issues/2412#issuecomment-755449680. Share. Where is it documented? We have to assign Null to variable to make it null. But. Solve The Error "TypeError: Cannot convert undefined or null to object" Solution 1: Check if the value is null or undefined before operating the function Solution 2: Use try-catch method Summary What is TypeError in JavaScript? I'll read through the links provided! When --strictNullChecks argument is used while TypeScript compiling, to assign undefined value, variable should be declared with undefined data type. To learn more, see our tips on writing great answers. Setting a default value for a function argument only works when nothing is passed for that argument into the function, so that should be why your default [] value doesn't work. How do I cast a JSON Object to a TypeScript class? Checking if a key exists in a JavaScript object? We hope this tutorial is helpful to you. We can only assign null to a variable that has the variable null. The strictNullChecks is flag is set to false by default. I am hoping to write a function that is generic enough to work across any of the different types and sized objects I have across my code code base. This means that a variable thats declared with one type can be converted to another type without explicitly converting the data to another type. The object type is a type that represents non-primitive objects. By default null and undefined handling is disabled, and can be enabled by setting strictNullChecks to true. rev2022.12.9.43105. We connect IT experts and students so they can share knowledge and benefit the global IT community. The nullish coalescing operator (??) I'm assuming since i need to visit every node i might be better off with DFS simply because of the memory usage. I wrote a pipe but when I using the pipe gives an error. undefined === null would also result to false. If i use generics is there a way to dynamically assign new generic types as a new type is found? How To Do Common JavaScript Object Operations, How to Check if a JavaScript Object is an Array, Things that You Don't Know About the JavaScripts Object Constructor. Since TypeScript is built on top of JavaScript, it has to handle the craziness of how JavaScript compare. For example, in the type definition of the Object.create method, we see that the type of the parameter is set to the object like in the following code: Likewise, in the signature of the setPrototypeOf method in the same type declaration, we see that the proto parameter, which is the parameter that takes the prototype of an object, also has the object type set, as it does below: This way, we cant pass in primitive values into these methods as arguments in TypeScript. This is likely happening in one of your Object.keys () calls. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, And what's the error? Where it does become useful is that we can have variables that can have values from more than one assigned to it with union types. Use the null-coalescing (??) So if you want this to run without an error, you have two options: Assign undefined, not null, because the type says it accepts either boolean or undefined. Does typescript have an easier way to recursively parse objects? Change the type to include null, e.g. nullundefined nullundefined2 Add Answer . The problems/questions I need to solve/answer: then have a function that converts null to undefined, ignores non object types, and recurses if its an object. Therefore, directly assigning values to a void variable isnt very useful. This will replace null with undefined in nested objects and arrays: Well my answer is not pretty, but this is what i got to work for me: You could use truthy-type values. I've written a couple of functions that effectively replicate JSON.stringify(), converting a range of values into stringified versions. The null type represents a variable that can only take on the value null. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. For example, we can do a useless assignment to a void variable like in the following code: We can set the return type of an arrow function to void by writing: Alternatively, we can set the return type to void for a traditional function like in the following code: Both function calls will output Void function returns nothing from the console.log statement inside the function. rev2022.12.9.43105. The error message I'm getting from the tester is: It seems to fail with: When I port my code over to JSBin and run it on some sample values, it functions just fine. if(expression) { console.log ('Not null')} } the expression must be evaluated to be true or false. To solve the TypeError: Cannot convert undefined or null to object in JavaScript, you can check if the value is null or undefined before operating the function or using try-catch method in JavaScript. It means the absence of any type. This solution is suggested in the open-source book for TypeScript Basarat Typescript Deep Dive.. Juggling-Check for Undefined and Null in Typescript. How can I determine if a variable is 'undefined' or 'null'? I hope someone solves it. Hebrews 1:3 What is the Relationship Between Jesus and The Word of His Power? To fix it, use if(obj === null) {return null} - without the qoutes around null. Does a 120cc engine burn 120cc of fuel a minute? I remembered what I had done and removed the extension from Chrome and ran the program again. Q&A for work. The answer explicitly asks for a generic way, and this is not generic. It. Something is currently unavailable: null. This is different from JavaScript in that the value null is the type object instead of null for historical reasons. Using flutter mobile packages in flutter web. When we convert null to a number it becomes zero. Making statements based on opinion; back them up with references or personal experience. Define New Object Literal You can define object literals in JavaScript. Thanks for contributing an answer to Stack Overflow! Lets follow this guide with the explanation and examples below to solve it. Can a prospective pilot be negated their certification because of too big/small hands? Learn more about Teams Is it just checking that the value isn't false, undefined, or null? Exclude<T, U>-- Exclude from T those types that are assignable to U. Extract<T, U>-- Extract from T those types that are assignable to U. NonNullable<T>-- Exclude null and undefined from T. ReturnType<T>-- Obtain the return type of a function type. The problem was gone. Look at the Example below to learn more about this Error. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. undefined can only be assignable to variables with the any type and the undefined type. . The value undefined means value is not assigned & you don't know its value. Typescript types are Nullable Types. 3. null is a valid . As that is usually by mistake, the solution is to check your code and fix the null/undefined condition so that the function either gets a proper Object, or does not get called at all. How to check for an undefined or null variable in JavaScript? Find centralized, trusted content and collaborate around the technologies you use most. I am working with React. The problem with both examples is that the object we are trying to access could be null or undefined. By default, it gets the value undefined. The null type variable can only take on the null value. Find centralized, trusted content and collaborate around the technologies you use most. They are intended to mean different things: Something hasn't been initialized : undefined. Many of my objects have nested objects as properties or arrays of values/objects. Its practically useless on its own, so we shouldnt see many cases with variables that have only the undefined type. How long does it take to fill up the tank? Undefined is a primitive value that indicates that the value is not assigned. Received a 'behavior reminder' from manager. TypeScript comparison of null and undefined Posted on: August 2, 2016 Comparing if something is null or undefined is a trivial task but can take different color depending to whom you talk. How to convert a string to number in TypeScript? 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"? How to Get the Last Character of a String in JavaScript, Solutions For Adding Types To Events In React Using TypeScript. Exactly -- instead of having to check if an object is null or undefined, you can use truthy type values to capture all of the associated values in a single umbrella. I am wanting to write a function that converts all instances of a property of any object that is null to undefined. evaluate when given null, only if given the string "null". We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Your email address will not be published. Then, we can specify something useful along with the null type. I haven't been able to find an easy way to have an unknown number of generic types, so my next thought is that I'll have to use the any type everywhere. How would you create a standalone widget from this widget tree? How do I remove a property from a JavaScript object? An object does not, There are a few simple ways to check if an object is an array. However, no type is a sub-type of, or assignable to, the never type except for other never variables. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, This is a bit confusing. But from the Typescript version 2.0, we can define Non Nullable types with the --strictNullChecks flag on. We can use typeof or '==' or '===' to check if a variable is null or undefined in typescript. What is the most efficient way to deep clone an object in JavaScript? Different pieces of data can be put together to build more complex data structures. Here we're mapping over an array of product IDs to convert them into an array of products. Undefined and null are types and as well as values. 5.2 TypeScript null undefined . Look at the example below to learn more about this solution. TypeScript rectifies these issues by letting us set fixed types for variables so that were sure of the types. I'm assuming I'd want to use a Breadth First Search or Depth First Search (I'm leaning towards Breadth First Search for this particular task). I wrote a book in which I share everything I know about how to become a better, more efficient programmer. Is there any reason on passenger airliners not to have a physical lock between throttles? Required fields are marked *. Exactly -- instead of having to check if an object is null or undefined, you can use truthy type values to capture all of the associated values in a single umbrella. I thought this might help. With the --strictNullChecks flag set when running the TypeScript compiler, null can only be assignable to variables with the any type and the null type. how much does tottenham's new stadium hold > collective term for players of sports in a university > typeerror: cannot convert undefined or null to object typescript. I will help you. operator to use a default value if is null or undefined. What's the \synctex primitive? Ready to optimize your JavaScript with Rust? I'd also love some advice on the approach/algorithm itself as well. The never type is a type of value that represents something that never occurs. What you want is to check value X and if it is null, convert it to undefined and then do some sort of logic. We then use .filter () to remove any undefined values by doing an existence check like we did in the beginning. In typescript we can set the data type of the variable to undefined/null explicitly. Not sure if it was just me or something she sent to the whole team. The never type is a sub-type of, and is assignable to, every type. QGIS expression not working in categorized symbology. operator to convert a value into a truthy type value. i.e you can assign Null & undefined to any of the types. Sorted by: 0. For example, if we write: Then, the code above would be compiled and run. That is, anything that's not a number, string, boolean, bigint, symbol, null, or undefined. Why is there a `null` value in JavaScript? If you are struggling with C, C++, Java, Python, JavaScript, or R programming languages, dont worry. So, once again, assigning a value to it is pretty useless. That's solved in. How do I test for an empty JavaScript object? TypeScript has a powerful system to deal with null or undefined values. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? This new behavior of non-nullable types is actually opt-in TypeScript version 2 and above, so we need to go into our tsconfig.json file to enable it. JavaScript check if value is only undefined, null or false, JavaScript String concatenation behavior with null or undefined values. JavaScript checking for null vs. undefined and difference between == and ===. 1 Answer. InstanceType<T>-- Obtain the instance type of a constructor function type. Generic way to convert all instances of null to undefined in Typescript, looping through an object (tree) recursively, Javascript object key value coding. So to avoid this, we use a Juggling check which will perform the . You can check if the variable is null or undefined before operating to avoid encountering this Error. Major: IT My guess is it will be undefined or null. This error occurs when you call the length() function but variable x does not have this function. to use a fallback value. We can only assign undefined to a variable that has the variable null. Not sure if it was just me or something she sent to the whole team. Solution 4: Using ?? Try this: {providers && providers.length && Object.values (providers).map ( (provider) => ( . To assign null value, variable should be declared with null . Are there breakers which can be triggered by an external signal and have to be reset by hand? When would I give a checkpoint to my D&D party that they can return to if they die? After about a day of working on the problem and turning the program upside down, in a post someone had mentioned Lucid. The null value means we know that it does not have any value. The only difference is that obj2 is a pure object, which means it doesnt inherit from any prototype. It is an unintentional absence of any value. It removes the need to change all nulls to undefined. Its more used for specifying the return data type of a function. Required fields are marked *. Name of the university: PTIT To prevent this error from happening Use conditional checks prior to triggering methods expecting an object. Asking for help, clarification, or responding to other answers. How to check if widget is visible using FlutterDriver. Technical Problem Cluster First Answered On April 5, 2022 Popularity 4/10 . How do I check for an empty/undefined/null string in JavaScript? You can solve this problem with the try-catch method in JavaScript. Helping others with the maintenance of life. In this article, well look at the void, null, undefined, never, and the object types. And Object.keys(null) throws the TypeError mentioned. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). typeerror: cannot convert undefined or null to object typescripttownhomes at tollgate creek. Undefined is different from the value null. That is, anything thats not a number, string, boolean, bigint, symbol, null, or undefined. To solve the TypeError: Cannot convert undefined or null to object in JavaScript, you can check if the value is null or undefined before operating the function or using try-catch method in JavaScript. cannot convert undefined or null to object Angular Object.keys(null). , object.keys.. JavaScript has a few data types that we have to know, to build programs with it. How can I determine if a variable is 'undefined' or 'null'? The undefined type can only be assigned the value undefined. This PR adds several predefined conditional types to lib.d.ts:. Passing in primitive values to the create method like in the code below will cause compilation to fail: The code above would get us an Argument of type 42 is not assignable to parameter of type object | null error for the first one, Argument of type abc is not assignable to parameter of type object | null for the second one. The TypeError in JavaScript occurs when you apply a specific operation to the value of Type and its incorrect. All in all, the error "TypeError: Cannot convert undefined or null to object" happens when attempting to convert a null and undefined values to an object. When should i use streams vs just accessing the cloud firestore once in flutter? To learn more, see our tips on writing great answers. How do I check for an empty/undefined/null string in JavaScript? To add another common example where this happens: this one work like magic on me thanks ! Are the S&P 500 and Dow Jones Industrial Average securities? Typescript is a superset of javascript with an extra feature, typing, and assertions, Every piece of code works in typescripts. objexts && Object.keys(objexts )?.map((objext, idx) =>. Connecting three parallel LED strips to the same power supply, What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked, Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup), Counterexamples to differentiation under integral sign, revisited. In example 2, our object car.date.month could also get the type of null or undefined. As it treats null and undefined likewise, we declare that an expression is . Connect and share knowledge within a single location that is structured and easy to search. Improve this answer. Im here. The void type is pretty much the opposite of the any type. Don't keep secrets ;D, Cannot convert undefined or null to object ))). Make sure that destination object is not empty ( null or undefined ). If we did, then we would get an error. In order to recursively handle all types : This answer is close, but doesn't handle null inside of nested arrays. When do I initialize variables in JavaScript with null or not at all? Its mainly used in the type definition of the Object object in the standard library and other pieces of code that dont want primitive values to be assigned to it, or passed into a function. Better way to check if an element only exists in one array. Choose the solution that is the most suitable for you. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The undefined type represents a variable that can only take on the value undefined. It is an unintentional absence of value. Its useful for declaring functions that dont return anything and not much else. console.log(undefined == null); console.log(undefined === null); The example shows that when using the loose equality operator (==), undefined is equal to null. But TypeScript never assigns null to any variable. What you want is to check value X and if it is null, convert it to undefined and then do some sort of logic. null is a different type and value from boolean and undefined. TabBar and TabView without Scaffold and with fixed Widget. With dynamically typed languages, its hard to determine the type that a variable has without logging it and we might assign data that we dont want in the variable. I'm not quite sure i understand the method fully. whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. How to connect 2 VMware instance running on same Linux host machine via emulated ethernet cable (accessible via mac address)? Is MethodChannel buffering messages until the other side is "connected"? The condition uses to check null or undefined values in javascript. Try accounting for the fact that the input parameter for the transform method can also be null or undefined: Thanks for contributing an answer to Stack Overflow! - html key/value, . null means that theres no value for a variable. If you are encountering the Error: TypeError: Cannot convert undefined or null to Object in JavaScript and has difficulties fixing it. By using typescript compiler tcs we transpile typescript code to javascript and then run the javascript file. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Does balls to the wall mean full speed ahead or full speed ahead and nosedive? How is this not generic? Japanese girlfriend visiting me in Canada - questions at border control? I removed the file and my modules now install fine. Connect and share knowledge within a single location that is structured and easy to search. 1. null is equal to undefined when compared with == (equality check) null is not equal to undefined when compared with === (strict equality check) 2. Cannot convert undefined or null to object typescript. Thanks! Array.isArray, In JavaScript, the Object constructor lets us create object wrapper with the given values. Is there a standard function to check for null, undefined, or blank variables in JavaScript? If he had met some scary fish, he would immediately return to the surface. When JavaScript returns null & undefined? Not the answer you're looking for? Null & Undefined looks similar, but there are few differences between them. Look at the example below to learn more about this Error. is there any function like string.isnullorempty() in javascript. In the sense that it doesn't use Generics? Christopher; December 9, 2022; Suppose you are looking for a method to . Solve The Error TypeError: Cannot convert undefined or null to object, Solution 1: Check if the value is null or undefined before operating the function, Cannot set property innerHTML of Null in JavaScript, Cannot convert undefined or null to Object in JavaScript, To load an ES module, set type module in JavaScript, How to Rename an Objects Key in JavaScript, Solutions For The Error TypeError: map.get is not a function In JavaScript, Solutions For Error TypeError: date.getHours Is Not A Function In JavaScript, How To Check If A Function Is Async In Javascript. The rest of this page applies for when strictNullChecks is enabled. So, once again, assigning a value to it is pretty useless. Variables can also contain any type at any time, depending on whats assigned. So if you pass the actual null value to your script, it will be parsed in the Object part of the code. As == only checks the value instead of the type, and if we use null in the if condition for undefined checking in TypeScript, it will execute the same operation for the null. Try logging curriculum.levels [i] before calling Object.keys (curriculum.levels [i]). nullish coalescing operator The nullish coalescing operator is used as two question marks ??.. Ready to optimize your JavaScript with Rust? Checking for either Fact is you will need to deal with both. 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