Codehs 8.1.5 Manipulating 2d Arrays !!top!! -

The core mechanism for manipulating a 2D array is the nested for loop. Because a 2D array is essentially an "array of arrays," a single loop is insufficient to reach every element. The outer loop typically iterates through the rows, while the inner loop traverses the columns of the current row. This structure provides a coordinate-like system, where every element is accessible via its row and column indices. In 8.1.5, learners practice how to use these indices not just to read data, but to modify it—whether by initializing a grid with specific values, updating a single entry, or transforming the entire data set based on a logical condition.

int max = matrix[0][0]; for (int row = 0; row < matrix.length; row++) for (int col = 0; col < matrix[row].length; col++) if (matrix[row][col] > max) max = matrix[row][col]; Codehs 8.1.5 Manipulating 2d Arrays

She started to feel the rhythm of the grid. It wasn't art, but it had a structure—a hidden beauty. The core mechanism for manipulating a 2D array

// Task 2: Write a function that returns a new 2D array with only the even numbers function getEvens(matrix) // Your code here It wasn't art, but it had a structure—a hidden beauty

: Use a nested loop to iterate through every row and column, incrementing a counter variable (e.g., totalElements ) for each value found. The Manipulation Method

Summing all values in a specific row, column, or the entire grid.

Changing every instance of one number to another (e.g., turning all s in a game board). Mathematical Operations: