ES6

1.What is the spread operator in JavaScript?

The spread operator is a syntax introduced in ECMAScript 6 (ES6) that allows an iterable (like an array or a string) to be expanded into individual elements. It is represented by three consecutive dots "..." and is used in various contexts in JavaScript.

When used with arrays, the spread operator can be used to:

• Copy an array: [...originalArray]
• Merge arrays: [...array1, ...array2]
• Add elements to an array: [...originalArray, element1, element2]
• Convert an iterable object (like a string) to an array: [...iterableObject]

The spread operator can also be used with objects to create a new object with properties from an existing object:

const obj1 = { x: 1, y: 2 };
const obj2 = { ...obj1, z: 3 };
console.log(obj2); // { x: 1, y: 2, z: 3 }

Overall, the spread operator is a useful and concise way to manipulate arrays and objects in JavaScript.