Function Piping in Javascript

example.repl

> var pipe = require('./pipe')
undefined
> var spread = pipe.spread
undefined
> function upper(s) { return s.toUpperCase() }
undefined
> pipe('foo',upper)
'FOO'
> function splitter(sp) { return function(str) { return str.split(sp) } }
undefined
> pipe('foo', upper, splitter(''))
[ 'F', 'O', 'O' ]
> function printArgs() { console.log(arguments) }
undefined
> pipe('foo', upper, splitter(''), spread(printArgs))
{ '0': 'F', '1': 'O', '2': 'O' }
undefined

pipe.js

// To be used with pipe. Will take the array which was accumulated and instead to the function arguments,
// versus being passed into the function as an array.
function spread(fn){
  return {
    call: function(th, accu){
      return fn.apply(th, accu);
    } 
  }
}

// Start with a base value and run it through all functions.
function pipe(base){
  return Array.prototype.slice.call(arguments, 1).reduce(function(accu, fn){
    return fn.call(undefined, accu);
  }, base);
} 

pipe.spread = spread;

module.exports = pipe;