While it is widely known that JavaScript's Array.prototype.forEach is generally slower than a traditional for loop due to the additional checks it incorporates, are there any scenarios where the built-in checks of forEach provide benefits over using a for loop?
Just to clarify, this question does not concern why the for loop outperforms forEach, but rather explores whether the extra checks in forEach serve any practical purpose.
One key distinction lies in the handling of sparse arrays when comparing forEach with a for loop.
An important difference is that forEach will not execute the callback function if it encounters an empty array element, resulting in the item being undefined. In contrast, a for loop will attempt to run the callback regardless.
Furthermore, breaking out of a forEach iteration is not as straightforward as with a for loop.
For more detailed information, visit https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach.
When using the forEach() method on an array, it will automatically skip over any empty elements (holes). On the other hand, if you use a traditional for loop, it will not disregard these empty elements.
To deliberately slow down the for loop, consider modifying the increment operation to be more intricate. Another way to introduce delays is by incorporating a complex condition that requires an inequality check during each iteration.
While forEach is tailored for specific tasks, using for provides greater flexibility.
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