Javascript Auto Increment Array

Question

Is there a shorthand way to auto increment a Javascript array like you can in PHP?

PHP Example:

$myArray=[];
$myArray[] = [ 'item1' , 'item2' ];
$myArray[] = [ 'item3' , 'item4' ];

JS Example:

let myArray = [];
myArray[ myArray.length ] = [ 'item1' , 'item2' ];
myArray[ myArray.length ] = [ 'item3' , 'item4 '];
//or
myArray.push( [ 'item1' , 'item2' ] );
myArray.push( [ 'item3' , 'item4' ] );

Without using myArray.length or myArray.push()

No, .push is the shortest/cleanest way to do that

Luca Kiebel
– Luca Kiebel

2018-09-09 14:14:42 +00:00
Commented Sep 9, 2018 at 14:14 — Luca Kiebel
– Luca Kiebel, Commented Sep 9, 2018 at 14:14
Possible duplicate of Javascript push() shorthand?

iainn
– iainn

2018-09-09 14:14:49 +00:00
Commented Sep 9, 2018 at 14:14 — iainn
– iainn, Commented Sep 9, 2018 at 14:14

CodeZombie · Accepted Answer · 2018-09-09 14:52:19Z

2

Here is the ES6 way, using spread operator

const arr1 = [1,2,3];
const arr2 = [3,4,5];
const arr3 = [...arr1, ...arr2]; // arr3 ==> [1,2,3,3,4,5]

OR

just by using the concat method

const arr1 = [1,2,3];
const arr2 = [3,4,5];
const arr3 = arr1.concat(arr2); // arr3 ==> [1,2,3,3,4,5]

edited Sep 9, 2018 at 14:52

answered Sep 9, 2018 at 14:47

CodeZombie

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Comments

Nina Scholz · Accepted Answer · 2018-09-09 15:46:48Z

1

Beside the given answers, you could use Array#splice with a great value for adding the values to the end of the array.

var array = [];

array.splice(Infinity, 0, ...['item1', 'item2']);
array.splice(Infinity, 0, ...['item3', 'item4']);

console.log(array);

answered Sep 9, 2018 at 15:46

Nina Scholz

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Comments

Rafael · Accepted Answer · 2018-09-09 14:43:05Z

0

There is certainly a way to do exactly the same thing; it even has similar construction:

let arr = ['a', 'b'];
arr = arr.concat([['c', 'd']]);//['a', 'b', ['c', 'd']]

PHP:

<?php
$arr = ["a", "b"];
$arr[] = ["c", "d"];
print_r($arr);
?>

Array
(
    [0] => a
    [1] => b
    [2] => Array
        (
            [0] => c
            [1] => d
        )
)

edited Sep 9, 2018 at 14:43

answered Sep 9, 2018 at 14:24

Rafael

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1 Comment

M. Eriksson Over a year ago

This would produce a different result compared to the OP's example, though. This would create a one dimensional array while the OP's example would create a multidimensional array.

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