Manipulating information is core to any programming language. JavaScript isn’t any exception, particularly as JSON has token over as a major information supply format. One such information manipulation is reversing arrays. It’s possible you’ll wish to reverse an array to indicate most up-to-date transactions, or easy alphabetic sorting.
Reversing arrays with JavaScript initially was achieved by way of reverse however that will 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();
Nowadays 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 essential in a programming language like JavaScript the place object references are significant.
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