You can go a long time as a JavaScript developer without ever feeling the need for generators. Hence, it’s natural to wonder: What are they good for? Why would you ever need one? What’s the point? But there generators can do some neat tricks. And they may even change the way you approach certain problems.

mrtillman

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Generators are an odd part of the JavaScript language. They have strange starred function definitions. They add this mysterious yield keyword. They let us tell the engine that some object can be used in a for...of loop or with spread syntax.

Why would anyone need JavaScript generator functions?

Why aren’t all these utility functions built-in?