Q671. What is an async function?
An async function is a function declared with the `async` keyword which enables asynchronous, promise-based behavior to be written in a cleaner style by avoiding promise ...
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Q672. How do you prevent promises swallowing errors?
While using asynchronous code, JavaScript’s ES6 promises can make your life a lot easier without having callback pyramids and error handling on every second line. But Pro...
Q673. What is deno?
Deno is a simple, modern and secure runtime for JavaScript and TypeScript that uses V8 JavaScript engine and the Rust programming language. It solves the inherent problem...
Q674. How do you make an object iterable in javascript?
By default, plain objects are not iterable. But you can make the object iterable by defining a `Symbol.iterator` property on it. Let's demonstrate this with an example, `...
Q675. What is a Proper Tail Call?
First, we should know about tail call before talking about "Proper Tail Call". A tail call is a subroutine or function call performed as the final action of a calling fun...
Q676. How do you check an object is a promise or not?
If you don't know if a value is a promise or not, wrapping the value as `Promise.resolve(value)` which returns a promise ```javascript function isPromise(object) { if (Pr...
Q677. How to detect if a function is called as constructor?
You can use `new.target` pseudo-property to detect whether a function was called as a constructor(using the new operator) or as a regular function call. 1. If a construct...
Q678. What are the differences between arguments object and rest parameter?
There are three main differences between arguments object and rest parameters 1. The arguments object is an array-like but not an array. Whereas the rest parameters are a...
Q679. What are the differences between spread operator and rest parameter?
Rest parameter collects all remaining elements into an array. Whereas Spread operator allows iterables( arrays / objects / strings ) to be expanded into single arguments/...
Q680. What are the different kinds of generators?
There are five kinds of generators, 1. **Generator function declaration:** ```javascript function* myGenFunc() { yield 1; yield 2; yield 3; } const genObj = myGenFunc(); ...