Adding/Changing Elements in a List Array

You can add to or modify the values of an existing array by simply referencing the array by number.
For example, to add an element to @colours, you might use the following line:

$colours[4] = "orange";

@colours would now include the elements: red, green, blue, brown and orange.

You can also use this method to overwrite an element in a list array.
To change a value in @colours, you might use the syntax:

$colours[0] = "yellow";

Now, the elements of @colours would be: yellow, green, blue, brown, orange.

Exercise
Write a line of code that changes Monday to Moonday in the array.

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