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Language/Type: JavaScript functions return string
Author: Melissa Hovik (on 2016/09/25)

Write a function named vowelCount that accepts a string and returns the number of vowels (a, e, i, o, or u) that the string contains.

For example, the call of vowelCount("kookaburra") should return 5 (two o's, 2 a's, and one u). When passed a string without any vowels (such as an empty string, "01234", or "sky"), 0 should be returned.

Function: Write a JavaScript function as described, not a complete program.

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