Kata description state: this means only that the number of "(" equals the number of ")" and provide example: ")(" => true

... but test cases expect that parenthesis are correctly opened/closed (ie: example )( should return false ^^)

Duplicate of http://www.codewars.com/kata/binary-search

)(() is balance?

1. Needs random test cases
2. Since your Kata description states that binary search should be used, there should be ideally at least a few tests to (try to) confirm that.

1. Why don't you try to disable indexOf? There are a lot of lazy guys(include me) ;-)

2. need more testcases, need some example testcase

3. Does the array contain duplicate targets?

needs random test cases

Duplicate:
http://www.codewars.com/kata/are-the-brackets-balanced