es6 get first and last element of array

Testy Teira answered on March 22, 2021 Popularity 10/10 Helpfulness 3/10

answer es6 get first and last element of array

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es6 get first and last element of array

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let {0 : a ,length : l, [l - 1] : b} = [1,2,3,4,5,6,7,8,9,0];
console.log(a, b)

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Source: stackoverflow.com

Tags: element get javascript

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Contributed on May 05 2021

Testy Teira

0 Answers Avg Quality 2/10

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how to get first and last element of array in javascript

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The rest parameter can only use at the end not anywhere else in the destructuring so it won't work as you expected.

Instead, you can destructor certain properties(an array is also an object in JS), for example, 0 for first and index of the last element for last.

let array = [1,2,3,4,5,6,7,8,9,0]

let {0 : a ,[array.length - 1] : b} = array;
console.log(a, b)
Expand snippet
Or its better way to extract length as an another variable and get last value based on that ( suggested by @Bergi) , it would work even there is no variable which refers the array.

let {0 : a ,length : l, [l - 1] : b} = [1,2,3,4,5,6,7,8,9,0];
console.log(a, b)

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Source: Grepper

Tags: element

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Contributed on Mar 22 2021

Santino

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array first and last element javascript

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//As of 2021, you can use Array.prototype.at()

let colors = ['red',  'green', 'blue']

let first = colors.at(0) // red
let last = colors.at(-1) // blue

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Source: Grepper

Tags: element javascript

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Contributed on Aug 08 2023

Coding Era

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es6 get first and last element of array

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