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How to Filter an Array in JavaScript
All JavaScript arrays have a built-in function .filter that allows you to filter certain elements and return a new array. To filter a JavaScript array, you need to write a function that will determine the filtering rule....
Strings and Numbers in JavaScript
JavaScript’s variables can hold values of different types. Each JavaScript value, however, has a strictly defined type. Let’s start with the differences between string and numbers in JS. Strings All text information in JavaScript is considered to be a string....
JavaScript Variables
Variable — is one of the key terms in programming. Luckily it’s not that complicated to learn. You can imagine a variable as a spreadsheet cell or a box in the warehouse....
How to destructure an array in JavaScript
JavaScript provides a very handy possibility to destructure any array and give custom names to the variables in it. Let’s assume we start with a simple array of numbers: const numbers = [1, 2, 3, 4, 5]; To get the first 2 elements from this array, we can use the destructuring assignment....
How to wait for all Promises to resolve in JavaScript
So you have a bunch of Promises, and you want to proceed only when all of them are resolved. In JavaScript there are 2 main approaches to solving this. ...
What is TypeScript and why should you use it?
What is TypeScript? TypeScript is a programming language developed and maintained by Microsoft. It introduces additional features like strict type binding (variables are bound to specific data types) to JavaScript and can also be compiled down to JavaScript as well....
JavaScript Interview Question #50: How does Intl.Collator work in JS
What is Intl.Collator and how does it work in JS? What’s the difference between two sorts? What will be logged to the console? . . . . . . ....
JavaScript Interview Question #49: Add a new array element by index
Will the length of the JS array change? What’s the output? . . . . . . . . . . . . . . . . . All JavaScript arrays have the push function....
JavaScript Interview Question #48: Dog-sized Cat. JS Object Properties
How many errors are in this code snippet? What’s the output? . . . . . . . . . . . . . . . . . In JavaScript there are two ways to get access to the object properties....
JavaScript Interview Question #47: How Object.setPrototypeOf works in JS
What is Object.setPrototypeOf in JavaScript? How does it work? What’s the output? . . . . . . . . . . . . . . . . . Theory The function Object....