The Spread Operator ...

The spread operator (...), introduced in ES6, provides another concise way to create shallow copies of arrays. Here’s an example:

let originalArray = [1, 2, 3];
let copyArray = [...originalArray];
 
console.log(copyArray); // [1, 2, 3]
console.log(copyArray === originalArray); // false

The spread operator (...) spreads the elements of originalArray into a new array, effectively creating a shallow copy. It’s important to note that all these methods create new array objects, which means you can modify the copy without affecting the original array. For example:

let originalArray = [1, 2, 3];
let copyArray = [...originalArray];
 
copyArray.push(4);
console.log(originalArray); // [1, 2, 3]
console.log(copyArray);     // [1, 2, 3, 4]

In this example, adding an element to copyArray doesn’t affect originalArray.

In summary, shallow copies of arrays can be easily created using methods like concat(), slice(), or the spread operator. These methods are useful for creating new arrays that can be manipulated independently of the original array.