30 Asked Interview Questions and Answers (2024)

The let keyword is used to declare block-scoped variables.

Example:

let x = 10; if (true) { let x = 20; console.log(x); } console.log(x);

let and const are block-scoped, while var is function-scoped. const is used for constants and cannot be reassigned.

Example:

const PI = 3.14; let x = 10; var y = 5;

Template literals are a way to create strings with embedded expressions. They are enclosed by backticks (`).

Example:

let name = 'John'; let greeting = `Hello, ${name}!`;

Arrow functions are a concise way to write functions. They do not have their own 'this' and 'arguments'.

Example:

const add = (a, b) => a + b;

Destructuring assignment allows you to extract values from arrays or objects and assign them to variables.

Example:

const person = { name: 'John', age: 30 }; const { name, age } = person;

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