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Contents
module Enumerable
# Yield each element to the block and return the result
# of the block when that result evaluates as true,
# terminating early like #detect and #find.
#
# obj1 = Object.new
# obj2 = Object.new
#
# def obj1.foo?; false; end
# def obj2.foo?; true ; end
#
# def obj1.foo ; "foo1"; end
# def obj2.foo ; "foo2"; end
#
# [obj1, obj2].find_yield{ |obj| obj.foo if obj.foo? } #=> "foo2"
#
# Another example.
#
# [1,2,3,4,5].find_yield{ |i| j = i+1; j if j % 4 == 0 } #=> 4
#
# If the block is never true, return the object given in the first parameter,
# or nil if none specified.
#
# [1,2,3].find_yield{ |_| false } #=> nil
# [false].find_yield(1){ |_| false } #=> 1
#
def find_yield(fallback=nil) #:yield:
each do |member|
result = yield(member)
return result if result
end
fallback
end
# Alias for #find_yield.
#
# DEPRECATE: This has been renamed to #find_yield.
alias_method :map_detect, :find_yield
end
Version data entries
10 entries across 9 versions & 2 rubygems