Codehs 8.1.5 Manipulating 2d Arrays -

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.

var arrayName = [[value1, value2, ...], [value3, value4, ...], ...]; For example: Codehs 8.1.5 Manipulating 2d Arrays

arrayName[rowIndex][columnIndex] For example: var myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]; myArray

In CodeHS, you can declare and initialize a 2D array using the following syntax: var myArray = [[1

arrayName.splice(rowIndex, 1); For example:

for (var i = 0; i < arrayName.length; i++) { arrayName[i].splice(columnIndex, 1); } For example: