Hands-On Design Patterns with React Native

Using generators as a factory for iterators

We will also need to know how to use generators (for instance, for Redux Saga), so we should get fluent in writing them. It turns out they can act like a factory for the iterators that we have learned already.

A quick recap on generators—they are functions with * and yield operators within their scope, such as, function* minGenExample() { yield "a"; }. Such functions execute until the yield keyword is encountered. Then, the function returns with the yield value. Functions can have many yields, and on their first call, return Generator. Such a generator is iterable. Look at the following:

const a = function* gen() { yield "a"; };console.log(a.prototype)// Generator {}

We can now use this knowledge ...