Interview Question

Why is JavaScript used?

JavaScript provides program logic while hosts provide APIs such as the DOM.

💡 Concept ✅ Quick Revision ⚡ JavaScript

Answer

JavaScript is used to write programmable behavior in web pages and other host environments. • In browsers it handles events, updates documents, and communicates over networks through web APIs. • The language can also power servers, tools, and applications in suitable runtimes. • Available capabilities depend on the host environment, not ECMAScript alone.

Example

Code

document.querySelector('button')?.addEventListener('click', () => {
  console.log('Clicked');
});

Output

Clicked

Quick Revision

JavaScript provides program logic while hosts provide APIs such as the DOM.

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