Fairmont-Multimethods
Fairmont-Multimethods is a JavaScript library providing support for multimethods in JavaScript.
Installation
npm i -S fairmont-multimethods
Usage
``coffee
equal = Method.create
description: "'Deep' equality operator"
default: (a, b) -> a == b # fallback to shallow equality
when comparing objects, recursively check the values
corresponding to the union of their properties—
return false on the first inequality
Method.define equal, isObject, isObject, (a, b) ->
(a == b) || do ->
keys = new Set (Object.keys a)..., (Object.keys b)...
for key from keys
if ! equal a[key], b[key]
return false
true
when comparing arrays, recursively check values
after making sure they're the same length
return false on the first inequality
Method.define equal, isArray, isArray, (ax, bx) ->
(ax == bx) || do ->
return false if ax.length != bx.length
for i in [0..ax.length]
if !equal ax[i], bx[i]
return false
true
equal "this", "this" # => true, shallow equality works here
equal { x: 1, y: 2 }, { x: 1, y: 2 } # => true, deep equality
equal [1..5], [1..5] # true, deep equality
equal { x: 1, y: 2}, [1..5] # false
``
API documentation.