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javascript-generators.md

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Javascript Generators

Run to completion: the yield keyword can pause a function, holding it's state in place. It can be paused more than once.

ES6 generator functions are "cooperative" in their concurrency behavior. Inside the generator function body, you use the new yield keyword to pause the function from inside itself. Nothing can pause a generator from the outside; it pauses itself when it comes across a yield.

In order to restart a paused generator, it must be evoked from OUTSIDE.

Stopping and starting is not just a control on the execution of the generator function, but it also enables 2-way message passing into and out of the generator, as it progresses.

Send messages out with yield, in with each restart.

Syntax

  • function *foo () {} AND function* foo () {} are both valid syntax.

  • yield expression (not yield statement)