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Contents
# -*- coding: utf-8 -*-
require 'funkr/categories'
# Extends Hash capabilities
class Hash
# maps function over hash values
def map_v # &block
h = Hash.new(self.default)
self.each{|k,v| h[k] = yield(v)}
return h
end
# maps function over hash keys
def map_k # &block
h = Hash.new(self.default)
self.each{|k,v| h[yield(k)] = v}
return h
end
# maps function over hash keys and values. Block should take
# 2 parameters, and should return a 2 elements array.
def map_kv # &block
h = Hash.new(self.default)
self.each do |k,v|
nk, nv = yield(k,v)
h[nk] = nv
end
return h
end
include Funkr::Categories
class << self
def mzero; self.new(); end
end
### Categories
# Hash is a functor via map_v, but unfortunatly a dumb map method is
# already defined by the enumerable module, and is kept for
# compatibility
# Hash is a monoid if values type is a monoid
include Monoid
extend Monoid::ClassMethods
def mplus(m_y)
self.merge(m_y){|k, v1, v2| v1.mplus(v2)}
end
end
Version data entries
9 entries across 9 versions & 1 rubygems