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Time estimate: 90 min. In the last lesson, we mentioned that you can use a variable for the index of an array. You can even do math with that index and have an arithmetic expression inside the [], like below.
What does the code above print out? You can follow the code in this visualizer and look at the image depicting the array below. Coding Exercise. What do you think the following code will print out? First trace through it on paper keeping track of the array and the index variable. Then, run it to see if you were right. You can also follow it in the visualizer by clicking on the Show Code Lens button. We can use iteration with a for loop to visit each element of an array.
This is called traversing the array. Just start the index at 0 and loop while the index is less than the length of the array. Note that the variable i short for index is often used in loops as the loop counter variable and is used here to access each element of an array with its index.
For example, here is a loop traversing the highScores array to print every score. Follow the code below in the visualizer. Using a variable as the index is a powerful data abstraction feature because it allows us to use loops with arrays where the loop counter variable is the index of the array! This allows our code to generalize to work for the whole array. Try the Code Lens button. Did the code work without changing the loop? The following code demonstrates a loop that changes the values in an array.
