Promise.all and its own implementation/Polyfill. Asked in Amazon|Microsoft
This covers polyfill/own implementation of the Promise.all in Javascript. This is very popular among the interviewer in UI technologies.
The Promise.all() method takes an iterable of promises as an input and returns a single Promise that resolves to an array of the results of the input promises. This returned promise will resolve when all of the input's promises have been resolved, or if the input iterable contains no promises. It rejects immediately upon any of the input promises rejecting or non-promises throwing an error and will reject with this first rejection message/error.
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00:00 introduction
00:25 Definition of Promise.all
02:16 Example of Promise.all
09:00 Polyfill of Promise.all
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