Question

How to create a two dimensional (2D) array and initialize the array with random number in JavaScript

Answer 1

const rows = 3;
const cols = 4;
const arr = new Array(rows).fill(new Array(cols).fill(Math.random()));

console.log(arr);




/*
run:

[
  [
    0.11530547323750406,
    0.11530547323750406,
    0.11530547323750406,
    0.11530547323750406
  ],
  [
    0.11530547323750406,
    0.11530547323750406,
    0.11530547323750406,
    0.11530547323750406
  ],
  [
    0.11530547323750406,
    0.11530547323750406,
    0.11530547323750406,
    0.11530547323750406
  ]
]

*/

 

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Answer 2

function randomMinMax(min, max) { 
    return Math.floor(Math.random() * (max - min + 1) + min)
}

const rows = 3;
const cols = 4;
const arr = new Array(rows).fill(new Array(cols).fill(randomMinMax(1, 10)));

console.log(arr);




/*
run:

[ [ 9, 9, 9, 9 ], [ 9, 9, 9, 9 ], [ 9, 9, 9, 9 ] ]

*/

 

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