JavaScript: Opposite Arrays


Manipulating knowledge is core to any programming language. JavaScript isn’t any exception, particularly as JSON has token over as a major knowledge supply layout. One such knowledge manipulation is reversing arrays. It’s possible you’ll wish to opposite an array to turn most up-to-date transactions, or easy alphabetic sorting.

Reversing arrays with JavaScript at the beginning was once finished by the use of opposite however that might mutate the unique array:

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

// Opposite it with out reassigning:
arr.opposite();

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

Editing the unique array is a legacy method. To steer clear of this mutation, we might replica the array after which opposite it:

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

At the present time we will use toReversed to steer clear of mutating the unique array:

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

Warding off mutation of knowledge items is amazingly vital in a programming language like JavaScript the place object references are significant.

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