js build 2d array from 1d arrays code example

Example 1: how to create 2d array in javascript

// program to create a two dimensional array

function twoDimensionArray(a, b) {
    let arr = [];

    // creating two dimensional array
    for (let i = 0; i< a; i++) {
        for(let j = 0; j< b; j++) {
            arr[i] = [];
        }
    }

    // inserting elements to array
    for (let i = 0; i< a; i++) {
        for(let j = 0; j< b; j++) {
            arr[i][j] = j;
        }
    }
    return arr;
}

const x = 2;
const y = 3;

const result = twoDimensionArray(x, y);
console.log(result);

Example 2: javascript create 2d array

function create2DArray(rows, columns, value = (x, y) => 0) {
  var array = new Array(rows);
  for (var i = 0; i < rows; i++) {
    array[i] = new Array(columns);
    for (var j = 0; j < columns; j++) {
      array[i][j] = value(i, j);
    }
  }

  return array;
}

var array = create2DArray(2, 3, (row, column) => row + column);
console.log(array);
//output: [[0, 1, 2],
//         [1, 2, 3]]