chain

v0.9.6

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5 years ago

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`chain` maps a function over a list and concatenates the results.

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chain (

fn:Function,

list:Array

) : Array

chain maps a function over a list and concatenates the results. chain is also known as flatMap in some libraries.

Dispatches to the chain method of the second argument, if present, according to the FantasyLand Chain spec.

If second argument is a function, chain(f, g)(x) is equivalent to f(g(x), x).

Acts as a transducer if a transformer is given in list position.

Example

const duplicate = n => [n, n];
     R.chain(duplicate, [1, 2, 3]); //=> [1, 1, 2, 2, 3, 3]

     R.chain(R.append, R.head)([1, 2, 3]); //=> [1, 2, 3, 1]

Arguments

fn: Function

The function to map with

list: Array

The list to map over

Returns

Array

The result of flat-mapping `list` with `fn`