Question

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

Answer 1

const rows = 4;
const cols = 5;
const arr = new Array(rows).fill(new Array(cols).fill(Math.random()));
 
console.log(arr);
 
 
 
 
/*
run:
 
[
  [
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913
  ],
  [
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913
  ],
  [
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913
  ],
  [
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913,
    0.08193485358632913
  ]
]

*/

 

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Answer 2

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

const rows = 4;
const cols = 5;
const arr = new Array(rows).fill(new Array(cols).fill(randomMinMax(1, 10)));
 
console.log(arr);
 
 
 
 
/*
run:
 
[
  [ 3, 3, 3, 3, 3 ],
  [ 3, 3, 3, 3, 3 ],
  [ 3, 3, 3, 3, 3 ],
  [ 3, 3, 3, 3, 3 ]
]

*/

 

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