Copying arrays and objects

Copying arrays

const arr = [1, 2, 3, 4, 5];

// Copying with the spread operator

const copyOne = [...arr];

// Copying with slice

const copyTwo = arr.slice();

// Copying with map

const copyThree = arr.map((number) => number);

// Copying with Array.from()

const copyFour = Array.from(arr);

// Copying with a for-loop

const copyFive = [];

for (let i = 0; i < arr.length; i++) {
  copyFive[i] = arr[i];
}

// Copying with JSON.stringify() and JSON.parse()

const copySix = JSON.parse(JSON.stringify(arr));

Copying objects

const obj = {
  name: John,
  lastName: Doe,
};

// Copying with the spread operator

const copyOne = { ...obj };

// Copying with Object.assign()

const copyTwo = Object.assign({}, obj);

// Copying with JSON.stringify() and JSON.parse()

const copyThree = JSON.parse(JSON.stringify(obj));