Technical Question Bank · Peer-Reviewed
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (963 available).
The functions which are created with `Function constructor` do not create closures to their creation contexts but they are always created in the global scope. i.e, the fu...
The **@** symbol is in fact a JavaScript expression used to signify decorators. _Decorators_ make it possible to annotate and modify classes and properties at design time...
Short circuit conditions are meant for condensed way of writing simple if statements. Let's demonstrate the scenario using an example. If you would like to login to a por...
Starting from react-scripts@3.3.0+ releases onwards, you can now optionally start a new app from a template by appending `--template [template-name]` to the creation comm...
The length property of an array is useful to resize or empty an array quickly. Let's apply length property on number array to resize the number of elements from 5 to 2, `...
No, `statics` only works with `React.createClass()`: ```javascript someComponent = React.createClass({ statics: { someMethod: function () { // .. }, }, }); ``` But you ca...
An Observable is basically a function that can return a stream of values either synchronously or asynchronously to an observer over time. The consumer can get the value b...
If the ref callback is defined as an inline function, it will get called twice during updates, first with null and then again with the DOM element. This is because a new ...
The main difference between function declarations and class declarations is `hoisting`. The function declarations are hoisted but not class declarations. **Classes:** ```...
There are two main ways of implementing HOCs in React. 1. Props Proxy (PP) and 2. Inheritance Inversion (II). But they follow different approaches for manipulating the _W...
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