yield-star a by-hand made thing

yield-star.js

// attempts

var si= Symbol.iterator

function *realGenerator(){
	yield *[1,3,4,7,11]
}
var g1= realGenerator()
console.log(g1.next(),'=== 1')
console.log(g1[si]().next(),'=== 3')

function fakeGenerator(){
	var i= 1
	var o= {}
	o[si]= function(){
		console.log('si')
		return this
	}
	o.next= function(){
		return {value: i++, done: false}
	}
	return o
}
var f1= fakeGenerator()
console.log(f1.next(),' === 1')
console.log(f1[si]().next(),'=== 2')


console.log('yield* testing:')
function *yieldStar(a){
	yield *a;
	yield 1;
}

var g2= yieldStar(realGenerator())
console.log(g2.next(),'=== 1')

var f2= yieldStar(fakeGenerator())
console.log(f2.next(),'=== 1')