How to Make An Arrow Function Generic In TypeScript

What is the Syntax for Typescript Arrow Functions with Generics

You can use generics with arrow functions by specifying the generic type parameters between angle brackets (< and >) right before the function’s argument list in TypeScript. Arrow functions can be made generic using type parameters. You can define type parameters for arrow functions in the same way you do for regular function declarations. Syntax … Read more

TypeScript String split() Method

TypeScript String split() Method

TypeScript String split() method is “used to split a String object into an array of strings by separating the string into substrings.” Syntax string.split([separator][, limit]); Parameters separator − Specifies the character to use for separating the string. If the separator is omitted, the array returned contains one element of the entire string. limit − Integer specifying a limit … Read more

How to Fix Property ‘…’ has no initializer and is not definitely assigned in the constructor

How to Fix Property '...' has no initializer and is not definitely assigned in the constructor

The Property ‘…’ has no initializer and is not assigned in the constructor error occurs when the “class property is declared without a default value (or initializer), and it is also not assigned a value within the class’s constructor.” class MyClass { private name: string; constructor() { // name is not assigned here } } … Read more

How to Fix Can’t bind to ‘formGroup’ since it isn’t a known property of ‘form’

How to Fix Can't bind to 'formGroup' since it isn't a known property of 'form'

Can’t bind to ‘formGroup’ since it isn’t a known property of ‘form’ error typically occurs when using “Angular’s Reactive Forms module but forgot to import the ReactiveFormsModule in the app.module.ts file.” Here are the reasons and solutions to fix the error. ‘ReactiveFormsModule’ is not imported Ensure you have imported ReactiveFormsModule in your app.module.ts file. import … Read more

How to Fix Can’t bind to ‘ngModel’ since it isn’t a known property of ‘input’

How to Fix Can't bind to 'ngModel' since it isn't a known property of 'input'

Can’t bind to ‘ngModel’ since it isn’t a known property of ‘input’ error typically occurs when you are using the [(ngModel)] two-way data binding directive in Angular but forget to import “FormsModule” in app.module.ts file. To fix the Can’t bind to ‘ngModel’ since it isn’t a known property of ‘input’ error in Angular, import the … Read more

How to Read a JSON File in TypeScript

How to Read a JSON File in TypeScript

With TypeScript 2.9 and the introduction of the resolveJsonModule compiler option, you can directly import JSON modules in TypeScript, which is a much more elegant approach than reading the file via the filesystem. This approach also provides type-safety and intellisense benefits. Here’s how your tsconfig.json file looks like this: { “compilerOptions”: { “target”: “es2017”, “module”: … Read more

How to Ignore Errors in TypeScript Files

How to Ignore Errors in TypeScript Files

TypeScript provides several special comments to instruct the TypeScript compiler to suppress specific types of errors. Here are three ways to ignore errors in TypeScript files: @ts-ignore @ts-expect-error @ts-nocheck Method 1: How to ignore an error with @ts-ignore The @ts-ignore comment suppresses TypeScript errors on the next line. It’s often used when you know something is … Read more

How to Check If a Variable is a String in TypeScript [4 Ways]

How to Check If a Variable is a String in TypeScript

Here are the ways to check if a variable is a string in TypeScript: TypeScript Types Using typeof Operator Using instanceof Operator Using Object.prototype.toString() Method 1: Using TypeScript Types In TypeScript, you can specify types for variables when you declare them. If you specify a type for a variable, TypeScript will ensure that only values … Read more

How to Check if an Object is Empty in TypeScript

How to Check if an Object is Empty in TypeScript

In TypeScript, to check if an object is empty (i.e., it has no enumerable properties), you can use the “Object.keys()” function and check the length of the returned array. Method 1: Using the Object.keys() method Here are the steps to check if an Object is Empty in TypeScript: Using the Object.keys() Method Access the length … Read more

How to Check If Object is an Array in TypeScript

How to Check If Object is an Array in TypeScript

To check if an Object is an Array in TypeScript, use the “Array.isArray()” method. The isArray() method returns true if the passed value is an array and false otherwise. function isArray(obj: any): obj is Array<any> { return Array.isArray(obj); } const testObj = { key: “value” }; const testArray = [1, 2, 3]; console.log(isArray(testObj)); console.log(isArray(testArray)); Output … Read more