map

v0.9.6

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5 years ago

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Takes a function and

Function

Map

Utils

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map (

fn:Function,

list:Array

) : Array

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.

Example

const 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}

Arguments

fn: Function

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

list: Array

The list to be iterated over.

Returns

Array

The new list.