Use Spread Operator to Clone Arrays

Problem

Copying arrays with traditional methods can accidentally create references instead of new arrays.

Solution

Use the spread operator [...arr] to create a shallow copy of an array.

Benefit

Prevents mutation bugs and creates independent copies in one simple syntax.

Code Example

const original = [1, 2, 3];

// Clone array
const copy = [...original];

// Merge arrays
const merged = [...arr1, ...arr2];