When you want to exit just the current loop, a single break is enough. So certainly in this case, I would go with good coding habits over tiny optimisation considerations. Whatever solution you use, it represents constant time, and could not be a determining factor in the overall performance of the loop. Initialization: It is an expression or variable declaration evaluated once before the loop begins. ![]() length) concerns all iterations of the loop, this issue only applies to a single exit out of both loops. for keyword is used to create a for loop that consists of three optional expressions, enclosed in parenthesis () and separated by semicolons, followed by a block of code to be executed in the loop. Where the previous optimisation (concerning. There is also the consideration that CPUs are optimised to anticipate forward memory references, although this will only be relevant when the JS engine has decided to store the array as a contiguous block of memory.Īs for the use of labels: most would not consider this best practice. Iterating backward is also not guaranteed to run faster on modern engines. ![]() length value in a variable, modern JavaScript engines will run the for loop just as fast if you write it as in the first version. Concerning saving array.length: Even though in the early days of JavaScript it made a difference to save the.
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