Which Looping Method in JavaScript Delivers Optimal Performance: Caching vs. Shorthand?

Benchmarking Array Looping Methods in JavaScript

Books traditionally advocate for loop caching, as in this example:

for(var i=0, len=arr.length; i < len; i++){
    // blah blah
}

However, misconceptions prevail that compilers optimize the following shorthand syntax:

for(var i=0; i < arr.length; i++){
    // blah blah
}

Which one performs better in practice?

Benchmark Results

As per recent benchmarks on modern browsers: https://jsben.ch/wY5fo

Fastest Loop Method

The current optimal loop form, prioritizing syntactic clarity, is:

var i = 0, len = myArray.length;
while (i < len) {
    // your code
    i++
}

Conclusion

In JavaScript, clarity should prevail over cleverness. Runtime optimization should prioritize readability and avoid unnecessary complexity. The standard for-loop with length caching remains the fastest and most understandable method for looping through arrays.

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