Q151. What is the difference between null and undefined?
Below are the main differences between null and undefined, | Null | Undefined | | ----------------------------------------------------------------------------------------...
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Q152. What are the popular React-specific linters?
ESLint is a popular JavaScript linter. There are plugins available that analyse specific code styles. One of the most common for React is an npm package called `eslint-pl...
Q153. What is eval?
The eval() function evaluates JavaScript code represented as a string. The string can be a JavaScript expression, variable, statement, or sequence of statements. ```javas...
Q154. What is React Router?
React Router is a powerful routing library built on top of React that helps you add new screens and flows to your application incredibly quickly, all while keeping the UR...
Q155. What is the difference between window and document?
Below are the main differences between window and document, | Window | Document | | ----------------------------------------------------------------------------- | ------...
Q156. How React Router is different from history library?
React Router is a wrapper around the `history` library which handles interaction with the browser's `window.history` with its browser and hash histories. It also provides...
Q157. How do you access history in javascript?
The window.history object contains the browser's history. You can load previous and next URLs in the history using back() and next() methods. ```javascript function goBac...
Q158. What are the `<Router>` components of React Router v6?
React Router v6 provides below 4 `` components: 1. ``:Uses the HTML5 history API for standard web apps. 2. ``:Uses hash-based routing for static servers. 3. ``:Uses in-me...
Q159. How do you detect caps lock key turned on or not?
The `mouseEvent getModifierState()` is used to return a boolean value that indicates whether the specified modifier key is activated or not. The modifiers such as CapsLoc...
Q160. What is the purpose of `push()` and `replace()` methods of `history`?
A history instance has two methods for navigation purpose. 1. `push()` 2. `replace()` If you think of the history as an array of visited locations, `push()` will add a ne...