Re:Internals of Async / Await in JavaScript
by Zecc on Saturday September 02, 2023 @05:39AM
(#37359936)
You can use them in any place where you want to return a bunch of values, but not necessarily all in one go. This goes for bytes in a Uint8Array, points you want to draw in canvas, DOM elements you are selecting or generating on the fy, data objects you've downloaded from somewhere, etc.
The advantage of generators over arrays is that you don't have to allocate a large array, so you can handle large numbers of elements while keeping a lower memory footprint.
They can also hide batching/chunking logic. You could have code that repeatedly downloads of separate JSON files with 200, or 500, or 5000 elements at a time, then return a generator that goes through each element at a time. The consuming code will be none the wiser.
The advantage of generators over arrays is that you don't have to allocate a large array, so you can handle large numbers of elements while keeping a lower memory footprint.
They can also hide batching/chunking logic. You could have code that repeatedly downloads of separate JSON files with 200, or 500, or 5000 elements at a time, then return a generator that goes through each element at a time. The consuming code will be none the wiser.