33 lines
936 B
Ruby
Vendored
33 lines
936 B
Ruby
Vendored
module Kernel
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# call-seq:
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# obj.yield_self {|_obj|...} -> an_object
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# obj.then {|_obj|...} -> an_object
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#
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# Yields *obj* and returns the result.
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#
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# 'my string'.yield_self {|s|s.upcase} #=> "MY STRING"
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#
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def yield_self(&block)
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return to_enum(:yield_self) unless block
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block.call(self)
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end
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alias then yield_self
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##
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# call-seq:
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# obj.tap{|x|...} -> obj
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#
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# Yields `x` to the block, and then returns `x`.
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# The primary purpose of this method is to "tap into" a method chain,
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# in order to perform operations on intermediate results within the chain.
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#
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# (1..10) .tap {|x| puts "original: #{x.inspect}"}
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# .to_a .tap {|x| puts "array: #{x.inspect}"}
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# .select {|x| x%2==0} .tap {|x| puts "evens: #{x.inspect}"}
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# .map { |x| x*x } .tap {|x| puts "squares: #{x.inspect}"}
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#
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def tap
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yield self
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self
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end
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end
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