// declaration of a two-dimensional array
// 5 is the number of rows and 4 is the number of columns.
const matrix = new Array(5).fill(0).map(() => new Array(4).fill(0));
console.log(matrix[0][0]); // 0
var items =[
[1, 2, 3],//this is row 0
[4, 5, 6],//this is row 1
[7, 8, 9] //this is row 2
//cullom 0 cullom 1 cullom2
]
console.log(/* variable name */ items[/*row*/ 0][/*cullom*/ 0]);const m = 4;
const n = 5;
let arr = new Array(m); // create an empty array of length n
for (var i = 0; i < m; i++) {
arr[i] = new Array(n); // make each element an array
}
console.log(arr); // Output: [ [ <5 empty items> ], [ <5 empty items> ], [ <5 empty items> ], [ <5 empty items> ] ]