Here is a small program generating x to y numbers using generator in JS later we will implement equivalent function by using closure.

### Generating x to y numbers using Generator

```
function *genXtoY(x, y){
while(x < y)
yield x++
return x++
}
const _iter = genXtoY(1, 5)
_iter.next() //{ value: 1, done: false }
_iter.next() //{ value: 2, done: false }
_iter.next() //{ value: 3, done: false }
_iter.next() //{ value: 4, done: false }
_iter.next() //{ value: 5, done: true }
_iter.next() //{ value: undefined, done: true }
```

### Generating x to y numbers using closure

```
const genXtoY = (x, y) => {
const next = () => {
if(x <= y)
return {value: x++, done: (x - 1 === y)}
return {value: undefined, done: true}
}
return {next}
}
const _iter = genXtoY(1, 5)
_iter.next() //{ value: 1, done: false }
_iter.next() //{ value: 2, done: false }
_iter.next() //{ value: 3, done: false }
_iter.next() //{ value: 4, done: false }
_iter.next() //{ value: 5, done: true }
_iter.next() //{ value: undefined, done: true }
```

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