Multidimensional Arrays

Mission: Setlist Vault

A seating chart has rows and columns, not just one list. Read nested arrays and total their values in script.js; check the Console.

A multidimensional array is an array of arrays. The most common use is a 2D array (matrix) to represent tabular data.

Creating a 2D array

const seats = [["A1", "A2"], ["B1", "B2"]];
console.log(seats[1][0]);

Accessing elements

The first index chooses a row and the second chooses a column:

const matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
matrix[0][0]; // 1 — row 0, col 0
matrix[1][2]; // 6 — row 1, col 2
matrix[2][1]; // 8 — row 2, col 1

Iterating with nested loops

for (let row = 0; row < matrix.length; row++) {
    for (let col = 0; col < matrix[row].length; col++) {
        console.log(matrix[row][col]);
    }
}