map

map (pure)

Create a new array by transforming each element according to a function passed as an argument. These callback functions are often written as arrow functions.

let arr = [1, 2, 3, 4];

const newArr = arr.map((value) => value - 1);
console.log(newArr);
// => [0, 1, 2, 3]
console.log(arr);
// => [1, 2, 3, 4]

It is worth noting that the resulting array will always be of the same length as the original.

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Backlinks

• Array Transformations