{
let tell = function* (){
yield 'a';
yield 'b';
yield 'c';
}
let k = tell();
console.log(k.next());
console.log(k.next());
console.log(k.next());
}
{
let obj = {};
obj[Symbol.iterator]=function* (){
yield 'a';
yield 'b';
yield 'c';
}
for(let val of obj){
console.log(val);
}
}
{
let sta = function * () {
while(1){
yield '1';
yield '2';
yield '3';
}
}
let bfn = sta();
console.log(bfn.next());
}