Generators

Question 1

What are generators?

Answer 1

You can think of generators as processes (pieces of code) that you can pause and resume:

function* genFunc() {
    // (A)
    console.log('First');
    yield;
    console.log('Second');
}

Note the new syntax: function* is a new “keyword” for generator functions (there are also generator methods). yield is an operator with which a generator can pause itself. Additionally, generators can also receive input and send output via yield.

When you call a generator function genFunc(), you get a generator object genObj that you can use to control the process:

const genObj = genFunc();

The process is initially paused in line A. genObj.next() resumes execution, a yield inside genFunc() pauses execution:

genObj.next();
// Output: First
genObj.next();
// output: Second

” What are generators? “ (exploringjs.com). Retrieved October 4, 2024.