Created
December 21, 2011 21:11
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ruby is inconsistent
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#given | |
def store_for_later(something_i_can_invoke) | |
@something_i_can_invoke = something_i_can_invoke | |
end | |
#i want | |
SomeCommonCode = lambda { :bazinga } | |
store_for_later(SomeCommonCode) | |
@something_i_can_invoke.call | |
#to be the same as | |
store_for_later { :ohYeah } | |
@something_i_can_invoke.call | |
#and while we are here, duck typing should mean i can also do | |
class Invokable | |
def call | |
:yay | |
end | |
end | |
store_for_later(Invokable.new) | |
@something_i_can_invoke.call | |
#i can solve this with | |
def store_for_later(something_i_can_invoke=nil, &block) | |
@something_i_can_invoke = block_given? ? block : something_i_can_invoke | |
end | |
#and that's what stuff like event machine do: | |
# https://github.com/eventmachine/eventmachine/blob/master/lib/eventmachine.rb#L169 | |
# because ruby is terribly inconsistent when it comes to lambdas | |
# but most classes won't comply with this, like this classic: | |
[1,2,3].map { |i| i + 10 } | |
# => [11, 12, 13] | |
modifier = lambda { |i| i + 10 } | |
[1,2,3].map(modifier) | |
# => ArgumentError: wrong number of arguments(1 for 0) | |
from (irb):223:in `map' | |
from (irb):223 | |
from /Users/pcalcado/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in `<main>' | |
# this makes working with functions and callbacks in ruby frustrating =/ |
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