plumb

functional composition sugar

npm install plumb
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plumb

functional composition sugar

usage

var plumb = require('plumb')

var reverseString = plumb(
  plumb.invoke('split')
  plumb.invoke('reverse')
  plumb.invoke('join','')
)
// => Function

reverseString('hello')
// => "olleh"

api

Using jsig notation

plumb(...fns: Function) => (val: Value) => Value

Reutrns a function composing each of the argument functions in order. The return value of each function is used as the argument for each successive function.

plumb.pipe(val: Value, ...fns: Function) => Value

Immediately invoke a composition of functions fns on the value val. It helps me to think about fns as a crazy pachinko machine and val as the ball going in.

Equivalent to plumb(fns)(val)

plumb.invoke(methodName: String, ...args?: Value) => Function

Creates a function which invokes a method on an object, optionally with fixed arguments.

Example:

plumb.invoke('foo','bar')

returns the equivalent of

function callFoo(obj) {
  return obj.foo('bar')
}

plumb.tap(fn: Function) => (Value) => Value

Create a function which passes a value through (identity) and calls a function fn with that value.

Example:

var log = plumb.tap(function (x) { console.log(x)})

log(10)
// => 10
// side effect: console.log(10) was called

installation

$ npm install plumb

running the tests

From project root:

$ npm install
$ npm test

contributors

jden jason@denizac.org

license

MIT. (c) 2013 Agile Diagnosis hello@agilediagnosis.com See LICENSE.md

"...and visions of sugarplums danced in their heads"

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