Codehs 8.1.5 Manipulating 2d Arrays May 2026

Before we dive into the specifics of manipulating 2D arrays, let's quickly review what they are. A 2D array, also known as a matrix, is an array of arrays. It's a data structure that stores data in a tabular form, with rows and columns. Each element in a 2D array is identified by its row and column index.

var arrayName = [[value1, value2, ...], [value3, value4, ...], ...]; For example: Codehs 8.1.5 Manipulating 2d Arrays

arrayName[rowIndex][columnIndex] = newValue; For example: Before we dive into the specifics of manipulating

arrayName.push([newRowValues]); For example: Each element in a 2D array is identified

for (var i = 0; i < arrayName.length; i++) { arrayName[i].push(newValue); } For example:

var myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]; myArray[1][2] = 10; // myArray = [[1, 2, 3], [4, 5, 10], [7, 8, 9]]; Adding a new row to a 2D array can be done using the push() method.