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