The thing about `.map` and `.filter` is that it would be easy enough to create
functional versions:
```js
function* map(array, fn) {
for (var x of array) {
yield fn(x)
}
}
```
But harder to create methods:
```js
Iteratable.prototype.map = function(fn) {
for (var x of this) {
yield fn(x)
}
}
```
The reason being that not all iteratables share a prototype (to my knowledge).
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