With generator functions in ES2015 (ES6), we’re now able to define functions that can return multiple values with the help of the yield keyword. Here’s an example of a simple generator function:
Notice the use of the * character next to the function keyword, to indicate that it’s a generator function.
Now let’s create an instance of the generator and extract the values from it by calling next() on the generator and getting value:
next() returns an object with the value and a boolean called done that returns true if the generator is out of values:
You can use an infinite while in a generator function to create a function that will generate a new ID every time next() is called on it. In this case the infinite loop is not dangerous because it will only execute once with calls to next():
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