# map

Functor f => (a → b) → f a → f b

## Function Parameters

(fn)
The function to be called on every element of the input list.

(list)
The list to be iterated over.

Returns (Array) The new list.

## Function Technical Explanation

Takes a function and a functor, applies the function to each of the functor's values, and returns a functor of the same shape.
Ramda provides suitable map implementations for Array and Object, so this function may be applied to [1, 2, 3] or {x: 1, y: 2, z: 3}.
Dispatches to the map method of the second argument, if present.
Acts as a transducer if a transformer is given in list position.
Also treats functions as functors and will compose them together.

## Examples
```javascript
var double = x => x * 2;

R.map(double, [1, 2, 3]); //=> [2, 4, 6]

R.map(double, {x: 1, y: 2, z: 3}); //=> {x: 2, y: 4, z: 6}
```