def three_times(arg)
yield(arg)
yield(arg)
yield(arg)
end
three_times("x") { |val| puts val }
three_times(22) do |thing|
puts "Got #{thing}"
end
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Output
x
x
x
Got 22
Got 22
Got 22
|
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- Blocks that directly follow a method call are implicitly passed to the method.
- The method may call the proc by invoking yield and passing any arguments.
- You can test for the presence of a block using block_given?.
- yield(arg) if block_given?
- The block may be explicitly passed using the & operator.
def three_times(arg, &block)
block.call(arg)
block.call(arg)
block.call(arg)
end
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