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Pick the first and last items of an array

Written byPhuoc Nguyen
17 May, 2021
Last updated
17 May, 2021
If you want to receive the first and last items of a given array, you might think of the common way as following:
const length = arr.length;
const first = arr[0];
const last = arr[arr.length - 1];
Because an array is also an object, the `length` property can be accessed with the destructuring syntax:
const { length } = arr;
Also, an array item at any position can be accessed with its index. Hence, we can shorten three lines at the top with a single line:
const { length, 0: first, [length - 1]: last } = arr;

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