What is the reason for three.js utilizing for loops instead of while loops?

Could this be a Repeat Question?
Discussion on faster loops: while vs. for

In the world of three.js, I have noticed a common code pattern that exists in various programming languages:

for ( var i = 0, l = something.length; i < l; i++ ) {
    perform some actions using index i
}

However, I have come across information suggesting that in JavaScript, performance could potentially be improved by utilizing:

var i = something.length;
while(i--){
    perform some actions using index i
}

Does implementing this alternative approach actually result in noticeable performance enhancements? Is there a clear advantage to choosing one method over the other?

Answer №1

Is there a noticeable improvement in performance?

No, it is not reliable across different web browsers due to variations in JavaScript implementations.

Additionally, it's important to consider the direction in which your loops are iterating - for example, your `while` loop counts backward from n to 0 while the `for` loop counts forward from 0 to n. This difference can sometimes matter.

In general, focusing on micro-optimizations is rarely beneficial, especially in JavaScript where performance can vary greatly between different engines. Instead, prioritize writing code that is clear and maintainable, addressing specific performance issues only if they become apparent, and then optimizing based on the target environments.

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