Page 148 - JavaScript

var beforePrevious = 1;
while(true) {
var current = previous + beforePrevious;
beforePrevious = previous;
previous = current;
yield current; //This is like return but
//keeps the current state of the function
// i.e it remembers its place between calls
}
}

var fib = FibonacciGenerator();
fib.next().value; //2
fib.next().value; //3
fib.next().value; //5
fib.next().done; //false

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