JSFiddle - React, Tailwind, and code Playground

JavaScript

// Works in Chrome IF you "Enable Experimental JavaScript" under the flags chrome://flags/
// Does not work in FF due to different implementations of iterators

// Note the *
function* fib() {
     var i = 0, j = 1;
     while (true) {
         yield i;
         var t = i;
         i = j;
         j += t;
     }
 }

var iterator = fib();
for (var i = 0; i < 10; i++) {
    // Note the ".value"
    console.log(iterator.next().value);
}