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Editor to share with you what the generator in js is useful, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

* * Generator * *

The generator object can be obtained from the generator expression, or you can use the yield keyword to get a generator function, which you can call to get a generator object

Generator function

1. The function body contains the function of the yield statement and returns the generator object

two。 The generator object is an iterable object and is an iterator

3. Generator object, which is lazily evaluated

4. The function body will pop up the value when it encounters a yield statement and suspend the execution of the function.

5. Once again encountered the next function, the same process as the previous one

Two programs are equivalent and abbreviated by anonymous function expressions.

Yield from

Inc1 and inc2 function equivalent yield from abbreviation

Generator application

The generator is mainly used in co-programming coroutine, which is lighter than processes and threads. Co-programming is a non-preemptive scheduling.

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