There are a few ways to clone an array in JavaScript,
Object.assign
Object.assign allows us to make a shallow copy of any kind of object including arrays.
For example:
const a = [1,2,3];
const b = Object.assign([], a); // [1,2,3]
Array.slice
The Array.slice function returns a copy of the original array.
For example:
const a = [1,2,3];
const b = a.slice(0); // [1,2,3]
Array.from
The Array.slice function returns a copy of the original array. It takes array like objects like Set and it also takes an array as an argument.
const a = [1,2,3];
const b = Array.from(a); // [1,2,3]
Spread Operator
The fastest way to copy an array, which is available with ES6 or later, is the spread operator.
const a = [1,2,3];
const b = [...a]; // [1,2,3]
JSON.parse and JSON.stringify
This allows for deep copy of an array and only works if the objects in the array are plain objects. It can be used like this:
const a = [1,2,3];
const b = JSON.parse(JSON.stringify(a)); // [1,2,3]
