compose-k

v0.9.6

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Passing

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PUBLISHED

5 years ago

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3 KB

Returns the right-to-left Kleisli composition of the provided functions, each of which must return a value of a type supported by [`chain`](#chain).

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composeK (

null.null.null.functions:...Function

) : Function

Returns the right-to-left Kleisli composition of the provided functions, each of which must return a value of a type supported by chain.

R.composeK(h, g, f) is equivalent to R.compose(R.chain(h), R.chain(g), f).

Example

//  get :: String -> Object -> Maybe *
      const get = R.curry((propName, obj) => Maybe(obj[propName]))

      //  getStateCode :: Maybe String -> Maybe String
      const getStateCode = R.composeK(
        R.compose(Maybe.of, R.toUpper),
        get('state'),
        get('address'),
        get('user'),
      );
      getStateCode({"user":{"address":{"state":"ny"}}}); //=> Maybe.Just("NY")
      getStateCode({}); //=> Maybe.Nothing()

Argument

null.null.null.functions: ...Function

The functions to compose

Returns

Function