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27-iterable-iterator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Iterable & Iterator</title>
</head>
<body>
<script>
class CounterIteratorResult {
constructor(value, done) {
this.value = value;
this.done = done;
}
}
class CounterIterator {
constructor(value, max) {
this.value = value;
this.max = max;
}
next() {
try{
if(this.value > this.max){
return new CounterIteratorResult(this.value, true);
} else {
return new CounterIteratorResult(this.value, false);
}
} finally {
this.value++;
}
}
}
class CounterIterable {
constructor(value, max){
this.value = value;
this.max = max;
}
[Symbol.iterator]() {
return new CounterIterator(this.value, this.max);
}
}
const counter = new CounterIterable(1, 20);
for (const value of counter) {
console.info(value);
}
</script>
</body>
</html>