2D Arrays Basics

A 2D array is an array containing sub-arrays. Each sub-array can be seen as a row in a grid.For example:const cinema = [ [true, true], // Row 0 [false, true] // Row 1 ];This array represents a 2x2 grid (2 items in each row, and there are 2 rows).To create a 2D array of integers with 3 rows and 4 columns, you would write:const matrix = [ [1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12] ]; // 3x4 gridNote that in JavaScript, 2D arrays are flexible: sub-arrays do not need to contain the same data type, and they do not even need to be the same length.For example, you can mix types and lengths within the same 2D array:const mixed = [ [1, 2, 3], ["apple", "banana"], [true] ];