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31 lines
635 B
31 lines
635 B
require 'pp'
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def call_twice
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puts "Calling your block."
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ret1 = yield("very first")
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puts "The value of your block: #{ret1}"
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puts "Calling your block again."
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ret2 = yield("second")
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puts "The value of your block: #{ret2}"
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end
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call_twice do |which_time|
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puts "I'm a code block, called for the #{which_time} time."
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which_time == "very first" ? 1 : 2
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end
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class Hash
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def find_all
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new_hash = Hash.new
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each { |k,v| new_hash[k] = v if yield(k, v) }
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new_hash
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end
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end
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squares = {0=>0, 1=>1, 2=>4, 3=>9}
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print "squares = "
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pp squares
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(squares.find_all { |key, value| key > 1 }).each { |k,v| puts "#{k}: #{v}" }
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