Q461. What is same-origin policy?
The same-origin policy is a policy that prevents JavaScript from making requests across domain boundaries. An origin is defined as a combination of URI scheme, hostname, ...
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Q462. What is Jest?
_Jest_ is a JavaScript unit testing framework created by Facebook based on Jasmine and provides automated mock creation and a `jsdom` environment. It's often used for tes...
Q463. What is the purpose of void 0?
Void(0) is used to prevent the page from refreshing. This will be helpful to eliminate the unwanted side-effect, because it will return the undefined primitive value. It ...
Q464. What are the advantages of Jest over Jasmine?
There are couple of advantages compared to Jasmine: - Automatically finds tests to execute in your source code. - Automatically mocks dependencies when running your tests...
Q465. Is JavaScript a compiled or interpreted language?
JavaScript is an interpreted language, not a compiled language. An interpreter in the browser reads over the JavaScript code, interprets each line, and runs it. Nowadays ...
Q466. Give a simple example of Jest test case
Let's write a test for a function that adds two numbers in `sum.js` file: ```javascript const sum = (a, b) => a + b; export default sum; ``` Create a file named `sum.test...
Q467. How do you create a route in the Pages Router?
In Next.js pages router, you create routes by adding files to the `pages` directory: - `pages/index.js` - the homepage (/) - `pages/about.js` - the about page (/about) - ...
Q468. Is JavaScript a case-sensitive language?
Yes, JavaScript is a case sensitive language. The language keywords, variables, function & object names, and any other identifiers must always be typed with a consistent ...
Q469. What is flux?
**Flux** is an **application architecture** (not a framework or library) designed by Facebook to manage **data flow** in React applications. It was created as an alternat...
Q470. How do you create a dynamic route in Next.js?
In the pages directory, you can add bracket syntax to create dynamic routes: ```jsx pages/posts/[id].js → /posts/1, /posts/2, etc. pages/[username]/settings.js → /foo/set...