Fantasyland Protocols

This module provides a fantasy-land compatibility layer using protoduck. The compatibility layer includes protocol definitions for all protocols with methods listed in the fantasy-land spec, and includes automatic two-way compatibility between methods defined in either world.

That is: you can use protocol functions exported by protoduck-fl on any object(s) that have fantasy-land methods implemented, without any extra work, and and methods you define using protoduck-fl will automatically become available to fantasy-land users even if they are not directly using protoduck-fl.

Even multiple-dispatched protocols will work two-ways, so protoduck-fl is a great way to augment your fantasy-land implementations!

Example

// Basic two-way compatibility
> var Monoid = require('protoduck-fl/monoid')
> var fl = require('fantasy-land')

> Monoid(Number, { empty: () => 0 })

> (1)[fl.empty]()
0
> var obj = { [fl.empty]: () => ({}) }
[object Object]
> Monoid.empty(obj)
{}

// Multiple dispatch on fl methods
> var Setoid = require('protoduck-fl/setoid')
> Setoid(Number, [Number], {
    equals: (n) => +this === n
  })
> Setoid(Number, [String], {
    equals: (s) => +this === parseFloat(s)
  })
> Setoid(String, [Number], {
    equals: (n) => parseFloat(''+this) === n
  })
> (10)[fl.equals]("10")
> (5)[fl.equals]("5")
true
> ("1")[fl.equals](1)
true
> Setoid.equals("1", 1)
true