Javascript Generators test

Javascript Generators

function generator(pfunc){
    return function(){ // Generator object closure
        var i = 0; //state keeps track number of calls
        
        return {
            next: function(){ // iterator next() method
                var val = pfunc(i); //pfunc is the parameter function
                i++;
                return val;                
            }      
        };
    }(); // we are scoping all variables and functions inside of this IIFE 
}

function lazyPows(n) {
  return generator(function(i) {
    return Math.pow(i, n);
  });
}

function lazyOdds() {
  return generator(function(i) {
    return 2*i + 1;
  });
}

var squares = lazyPows(2);
console.log(squares.next()); // 0, 1, 4, 9, ...

var odds = lazyOdds();
console.log(odds.next());