Question

How to expand array and add new element to an array in JavaScript

Answer 1

let arr = [23, 54, 1];

console.log(arr);

arr[3] = 381

console.log(arr);




/*
run:

[ 23, 54, 1 ]
[ 23, 54, 1, 381 ]

*/

 

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Answer 2

let arr = [23, 54, 1];

console.log(arr);

arr.push(381);

console.log(arr);




/*
run:

[ 23, 54, 1 ]
[ 23, 54, 1, 381 ]

*/

 

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Answer 3

let arr = [23, 54, 1];

console.log(arr);

arr[5] = 381

console.log(arr);




/*
run:

[ 23, 54, 1 ]
[ 23, 54, 1, <2 empty items>, 381 ]

*/

 

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