Question

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

Answer 1

const rows:number = 3;
const cols:number = 4;
const arr: number[][] = new Array(rows).fill(new Array(cols).fill(Math.random()));
 
console.log(arr);
 
 
 
 
/*
run:
 
[[0.9907427414591212, 0.9907427414591212, 0.9907427414591212, 0.9907427414591212], 
 [0.9907427414591212, 0.9907427414591212, 0.9907427414591212, 0.9907427414591212], 
 [0.9907427414591212, 0.9907427414591212, 0.9907427414591212, 0.9907427414591212]] 

*/

 

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Answer 2

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

const rows:number = 3;
const cols:number = 4;
const arr: number[][] = new Array(rows).fill(new Array(cols).fill(randomMinMax(1, 10)));
 
console.log(arr);
 
 
 
 
/*
run:
 
[[2, 2, 2, 2], [2, 2, 2, 2], [2, 2, 2, 2]] 

*/

 

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