Challenge

Custom zip

The built-in zip function "zips" two lists. Write your own implementation of this function.

Define a function named zap. The function takes two parameters, a and b. These are lists.

Your function should return a list of tuples. Each tuple should contain one item from the a list and one from b.

You may assume a and b have equal lengths.

If you don't get it, think of a zipper.

For example:

zap(
    [0, 1, 2, 3],
    [5, 6, 7, 8]
)

Should return:

[(0, 5),
 (1, 6),
 (2, 7),
 (3, 8)]

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