updateValue(array, 2, array[2].length - 1, array[0][0] + array[2][array.length - 1]); Key Concept: Accessing the "Last" Element In Java, the last element of any row is always located at the index array[i].length - 1
Understanding 8.1.5 isn't just about passing CodeHS—it's a foundational skill for:
: Double-check your loop boundaries. Ensure the row loop stops before arr.length and the column loop stops before arr[row].length . Using <= instead of < is the most common cause of bugs. Codehs 8.1.5 Manipulating 2d Arrays
Adding a specific number to every element in a particular row. Finding a specific value and changing it. How to Approach the Problem (Step-by-Step) 1. Visualizing the Grid
What or incorrect output are you currently getting? Can you share your current code draft ? Share public link updateValue(array, 2, array[2]
matrix[1][2] = 10; console.log(matrix[1][2]); // Outputs 10
Manipulating elements requires visiting each cell systematically. Nested for loops are the standard mechanism for this process. Finding a specific value and changing it
Summary checklist
Controls the horizontal movement (moving from left column to right column within the current row). Common Manipulation Patterns
var array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]; for (var i = 0; i < array.length; i++) array[i].splice(1, 1); // remove column at index 1