Codehs 8.1.5 Manipulating 2d Arrays

CodeHS 8.1.5 — Manipulating 2D Arrays

CodeHS Unit 8.1.5 focuses on working with two-dimensional arrays (2D arrays), a core data structure for representing grid-like data such as images, game boards, matrices, and spreadsheets. This text explains what 2D arrays are, common tasks you’ll perform, and clear, practical techniques for manipulating them.

In Java, the syntax array[row][col] is used to get or set a value. The Goal of CodeHS 8.1.5 Codehs 8.1.5 Manipulating 2d Arrays

2. Modifying Elements

Assign a new value to a specific position. CodeHS 8

Example Code

// Initialize a 2D array
var array = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];
Manipulating 2D arrays is a fundamental skill in Java programming, and the CodeHS 8.1.5 exercise is designed to test your ability to navigate and modify these structures. In this guide, we will break down the logic required to master this lesson and provide you with the tools to handle grid-based data effectively. Understanding the 2D Array Structure The Goal of CodeHS 8
Now that we've covered the basics, let's move on to the fun part – manipulating 2D arrays! In exercise 8.1.5, you'll learn how to perform various operations on 2D arrays.
This is the standard way to "visit" every cell in a 2D array. The outer loop handles the rows, while the inner loop handles the columns.
Row 1: fixArray(array, 0, array[0].length - 1, array[0].length);
var myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
for (var i = 0; i < myArray.length; i++) 
  myArray[i].splice(1, 1);