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@ -1,7 +1,7 @@
# Iterables # Iterables
*Iterable* objects is a generalization of arrays. That's a concept that allows to make any object useable in a `for..of` loop. *Iterable* objects is a generalization of arrays. That's a concept that allows us to make any object useable in a `for..of` loop.
Of course, Arrays are iterable. But there are many other built-in objects, that are iterable as well. For instance, strings are also iterable. Of course, Arrays are iterable. But there are many other built-in objects, that are iterable as well. For instance, strings are also iterable.
@ -224,12 +224,12 @@ let arr = Array.from(range);
alert(arr); // 1,2,3,4,5 (array toString conversion works) alert(arr); // 1,2,3,4,5 (array toString conversion works)
``` ```
The full syntax for `Array.from` allows to provide an optional "mapping" function: The full syntax for `Array.from` also allows us to provide an optional "mapping" function:
```js ```js
Array.from(obj[, mapFn, thisArg]) Array.from(obj[, mapFn, thisArg])
``` ```
The optional second argument `mapFn` can be a function that will be applied to each element before adding to the array, and `thisArg` allows to set `this` for it. The optional second argument `mapFn` can be a function that will be applied to each element before adding it to the array, and `thisArg` allows us to set `this` for it.
For instance: For instance: