What is the TypeScript language? What can it do that JavaScript or available libraries cannot do, that would give me reason to consider it?

Jul 20, 2019 · In JavaScript, it's commonly seen as best practice to use === instead of ==, for obvious and well-known reasons. In TypeScript, which is one to be preferred? Is there even …

In short, when you care that let a variable assigned from a possible null undefined source, and you wish to provide a default value to the variable, use the nullish coalescing operator ??. If …

Oct 21, 2024 · I'm working on a project using Vite, and I want to understand the difference between using TypeScript alone and TypeScript with SWC. I've searched online but couldn't …

Object types An object in JavaScript is a key/value map, and an "object type" is typescript's way of typing those key/value maps. Both interface and type can be used when providing types for …

Dec 13, 2021 · “&& - means AND.” is quite an incomplete description. See Logical operators in JavaScript — how do you use them?. “ a && b evaluates to the first falsy operand” is correct.

Extends VS implements extends: The extended child class will inherit all the properties and methods of the class it extends. implements: The class with the implements keyword will need …

Feb 16, 2017 · Specifically, the operation x! produces a value of the type of x with null and undefined excluded. Similar to type assertions of the forms <T>x and x as T, the ! non-null …

JavaScript freely converts between these types. When you access a method like charAt on a string primitive, JavaScript wraps it in a String object, calls the method, and then throws the …

Jan 8, 2020 · If you use private fields in TypeScript and are targeting ES2021 or older versions of JavaScript for your output, TypeScript will generate code that emulates the runtime behavior of …