Coderbyte Ex Oh (Easy)

Challenge
Using the JavaScript language, have the function ExOh(str) take the str parameter being passed and return the string true if there is an equal number of x‘s and o‘s, otherwise return the string false. Only these two letters will be entered in the string, no punctuation or numbers. For example: if str is “xooxxxxooxo” then the output should return false because there are 6 x’s and 5 o’s.
Hint
You can write a simple loop that maintains two counts for each of the letters, then at the end check to see if they are equal.
Sample Test Cases

Input: “xooxxo”
Output: “true”
Input: “x”
Output:”false”

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