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• JavaScript string.replace("a", "b") only replaces the first occurrence of "a" with "b".
• This is contrary to Python's string.replace("a", "b") which replaces all occurrence of "a" with "b".
• This thread in StackOverflow, https://stackoverflow.com/questions/1392413/calculating-a-directory-size-using-python, have the solution.
• The JavaScript codes for replacing all occurrence of strings are these.

str.replace(/a/g, "b");

• The codes will replace all "a" with "b".
• The first parameter is a regular expression (regex).