edtsech / chain-fns

Chain-fns

Library of one function which helps you chain your functions.

Example:

FUNCIONS = {
  add: function(a, b) {
    return a + b;
  },
  square: function(x) {
    return x * x;
  }
}

f = chain(FUNCIONS)

Now you can f has all functions from MY_FUNCIONS and also you can use chaining:

f.add(1,1) // => 2

f(1).add(1).square()() // => 4

Last couple of parentheses needed to call the wrapper function which returns final value.

Underscore.js or Lo-Dash

Lo-Dash and Underscore.js has chaining mechanism:

_.chain([1,2,3]).map(function(x) { return x * x}).tail().value() // => [4,9]

If you want to make it a little bit shorter, just assign _.chain to some variable:

f = _.chain
f([1,2,3]).map(function(x) { return x * x}).tail().value() // slightly shorter chaining 
_([1,2,3]).map(function(x) { return x * x}) // if you want to use it w/o chaining
_.map([1,2,3], function(x) { return x * x}) // if you want to use it as a module

But if you like the way how it's done here, with function wrapper, try this:

f = chain(_)
f([1,2,3]).map(function(x) { return x * x}).tail()() // => [4,9]