method
returning
v2.3.8 -
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Class: Object
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- What's this?
returning(value)
public
Returns value after yielding value to the block. This simplifies the process of constructing an object, performing work on the object, and then returning the object from a method. It is a Ruby-ized realization of the K combinator, courtesy of Mikael Brockman.
Examples
# Without returning def foo values = [] values << "bar" values << "baz" return values end foo # => ['bar', 'baz'] # returning with a local variable def foo returning values = [] do values << 'bar' values << 'baz' end end foo # => ['bar', 'baz'] # returning with a block argument def foo returning [] do |values| values << 'bar' values << 'baz' end end foo # => ['bar', 'baz']
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Mange -
January 8, 2009
5 thanks
Watch out for syntax errors
Watch out when you are using returning with hashes. If you would write code like
def foo(bars) returning {} do |map| bars.each { |bar| map[bar.first] = bar } end end
you will get a syntax error since it looks like you tried to supply two blocks! Instead you should write it with parenthesis around the hash:
def foo(bars) returning({}) do |map| bars.each { |bar| map[bar.first] = bar } end end