Created
July 6, 2016 09:58
-
-
Save eflukx/7324c37b37f9f54691be0470074edcbf to your computer and use it in GitHub Desktop.
Voorbeelde met Ruby blocks en de enumerable mixin
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class Teller | |
include Enumerable | |
def initialize max = 100 | |
@max = max | |
@teller = 0 | |
end | |
def each | |
loop do | |
break if @teller >= @max | |
yield @teller += 1 | |
end | |
end | |
end | |
# Met blocks kun je makkelijk een iterator maken, we definieren hiertoe de each method | |
teller = Teller.new | |
teller.each do |c| | |
puts c | |
end | |
# zodra je each geimplementeerd hebt kun je de Enumerable module inmixen, hiermee krijg je | |
# meer Enumerable functies tot je beschikking zoals inject (a.k.a. reduce) | |
Teller.new(10).reduce([1]){ |ary, i| ary << i + ary.last } | |
# filter en selct | |
Teller.new(10).select{ |i| i < 3 or i > 8} | |
# of de to_a methode | |
Teller.new(10).to_a |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment