Q691. How do you combine two or more arrays?
The concat() method is used to join two or more arrays by returning a new array containing all the elements. The syntax would be as below, ```javascript array1.concat(arr...
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Q692. What is the difference between BrowserRouter, HashRouter, and MemoryRouter?
All three are drop-in `` implementations from `react-router-dom` (see [What are the `` components of React Router v6?](#what-are-the-router-components-of-react-router-v6)...
Q693. What is the difference between Shallow and Deep copy?
There are two ways to copy an object, **Shallow Copy:** Shallow copy is a bitwise copy of an object. A new object is created that has an exact copy of the values in the o...
Q694. What are dynamic routes and what are route parameters?
A **dynamic route** is a route path that contains a placeholder segment (a *route parameter*) instead of a fixed, hard-coded value, so a single route definition can match...
Q695. How do you create specific number of copies of a string?
The `repeat()` method is used to construct and return a new string which contains the specified number of copies of the string on which it was called, concatenated togeth...
Q696. How do you navigate programmatically in React Router?
In React Router v6+, programmatic navigation (redirecting from code rather than a user clicking a link) is done with the **`useNavigate`** hook, which replaces the old `h...
Q697. How do you return all matching strings against a regular expression?
The `matchAll()` method can be used to return an iterator of all results matching a string against a regular expression. For example, the below example returns an array o...
Q698. What is the difference between Link, NavLink, and `<a>`?
All three render an anchor tag in the DOM, but they behave very differently when clicked: | Aspect | `` | `` | `` | | --- | --- | --- | --- | | Navigation | Full page rel...
Q699. How do you trim a string at the beginning or ending?
The `trim` method of string prototype is used to trim on both sides of a string. But if you want to trim especially at the beginning or ending of the string then you can ...
Q700. How do you implement protected/private routes?
A protected (or private) route only renders its content when the user meets some condition (usually "is authenticated"), otherwise it redirects them elsewhere (e.g., to `...