Codehs 8.1.5 Manipulating 2d Arrays Jun 2026

console.log(grid[0][2]); // 3 (row 0, col 2)

The 2D length is the total count of all individual integers within the sub-arrays. You can find this by iterating through each row and adding the length of that row to a counter. length2D = Codehs 8.1.5 Manipulating 2d Arrays

Write a method swapRows(int[][] arr, int rowA, int rowB) that swaps the data of two rows. console

Here is a typical you might see:

function rotateClockwise(matrix) let result = []; let rows = matrix.length; let cols = matrix[0].length; // 3 (row 0

Rotate the entire 2D array 90 degrees clockwise. This is the classic "Manipulating 2D Arrays" test.

Remove last column: