According to this JSPerf the While ! Undefined style array loop is ~10x faster in all browsers. What are the disadvantages of this style of loop?
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According to this JSPerf the While ! Undefined style array loop is ~10x faster in all browsers. What are the disadvantages of this style of loop?
It is actually a bug in the test case, the iterator is not being reset to zero for each test run (i.e., only the first test run rolls the full loop, next runs have the iterator already past the end of the array, thus roll zero times). See corrected test suite for the true benchmark.
(Note: I haven’t inspected all test cases, others might be flawed as well)