JavaScript: Reverse Arrays

Manipulating knowledge is core to any programming language. JavaScript is not any exception, particularly as JSON has token over as a chief knowledge supply format. One such knowledge manipulation is reversing arrays. It’s possible you’ll need to reverse an array to point out most up-to-date transactions, or easy alphabetic sorting.

Reversing arrays with JavaScript initially was carried out by way of reverse however that might mutate the unique array:

// First worth:
const arr = ['hi', 'low', 'ahhh'];

// Reverse it with out reassigning:
arr.reverse();

// Worth:
arr (3) ['ahhh', 'low', 'hi']

Modifying the unique array is a legacy methodology. To keep away from this mutation, we would copy the array after which reverse it:

const reversed = [...arr].reverse();

Lately we will use toReversed to keep away from mutating the unique array:

const arr = ['hi', 'low', 'ahhh'];
const reversed = arr.toReversed(); // (3) ['ahhh', 'low', 'hi'];
arr; // ['hi', 'low', 'ahhh']

Avoiding mutation of information objects is extremely vital in a programming language like JavaScript the place object references are significant.