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Your condition is wrong. Because you cannot rely on the counts of character '(' or ')'.
Let me give you an example:
")()(" your solution will return true for this input string, however its not a valid parentheses.
The right parentheses not only the counts of '(' or ')' should be equal, but the order also need to be matched.
why is using substring considered better that charAt?
but i think my solution for the
Katamay be easier to understand (from JavaScript programmer's perspective):)
The kata's description says "Utilize the comprehension syntax in the following exercise"
2333333333333333333....