Codehs 8.1.5 Manipulating 2d Arrays -

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. To access an element in a 2D array, you need to specify its row and column index. The syntax is as follows:

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]]; This creates a 3x3 2D array with the specified values. Codehs 8.1.5 Manipulating 2d Arrays

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.

var myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]; var value = myArray[1][2]; // value = 6 Modifying an element in a 2D array is similar to accessing an element. You simply assign a new value to the element using its row and column index. Now that we've covered the basics, let's move

var myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]; myArray.splice(1, 1); // myArray = [[1, 2, 3], [7, 8, 9]]; Adding a new column to a 2D array requires modifying each row individually. You can use a loop to iterate over each row and add the new value.

for (var i = 0; i < arrayName.length; i++) { arrayName[i].splice(columnIndex, 1); } For example: The syntax is as follows: for (var i = 0; i &lt; arrayName

arrayName.push([newRowValues]); For example: