(We're talking about this thing)

function* myCoolGenerator() {}

Things that generator functions won't do for you

Make your app magically faster
Earn you blessings from the modern JavaScript fairies
Help you win friends and influence people

Things you may have heard about generator functions which are true but not very helpful

Generators are functions that you can exit and re-enter later
You can use a generator function to implement a finite state machine
They help you impress your friends and family

What are generators Functions?

A generator function creates a Generator!

What are generators, actually?

Exactly the same as Java Iterables or C# Enumerables!!!

Basic generator function

function* myCoolGenerator(limit) { // can have 0 or more inputs
  for (let i = 1; i <= limit; i++) {
    yield i; // produces a value
  }
  
  return; // signals that the generator is done
}

for (let element of myCoolGenerator(10)) {
  console.log(element);
}

// prints 1, 2, 3, ... , 10

the main idea of generators!!!

"Generators allow you to define a sequence of elements and process each element as it's produced rather than waiting until the entire sequence is produced"