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working through discussion of 7.2

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This commit is contained in:
Dan Buch 2011-10-06 22:17:11 -04:00
parent 2194c6637e
commit 697fc60bcb
1 changed files with 10 additions and 17 deletions
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27
cookbook/007/02.rb
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@ -1,21 +1,14 @@
def call_twice def call_twice
puts "I'm about to call your block." puts "Calling your block."
yield ret1 = yield("very first")
puts "I'm about to call your block again." puts "The value of your block: #{ret1}"
yield
puts "Calling your block again."
ret2 = yield("second")
puts "The value of your block: #{ret2}"
end end
call_twice { puts "Hi, I'm a talking code block." } call_twice do |which_time|
puts "I'm a code block, called for the #{which_time} time."
which_time == "very first" ? 1 : 2
def repeat(n)
if block_given?
n.times { yield }
else
raise ArgumentError.new("I can't repeat a block you don't give me!")
end end
end
repeat(4) { puts "Hello." }
repeat(4)