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Contents
#--
# Credit goes to Gavin Sinclair.
#++
module Enumerable
# Enumerable#none? is the logical opposite of the builtin method
# Enumerable#any?. It returns +true+ if and only if _none_ of
# the elements in the collection satisfy the predicate.
#
# If no predicate is provided, Enumerable#none? returns +true+
# if and only if _none_ of the elements have a true value
# (i.e. not +nil+ or +false+).
#
# [].none? # true
# [nil].none? # true
# [5,8,9].none? # false
# (1...10).none? { |n| n < 0 } # true
# (1...10).none? { |n| n > 0 } # false
#
def none? # :yield: e
if block_given?
not self.any? { |e| yield e }
else
not self.any?
end
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCEnumerable < Test::Unit::TestCase
def test_none?
a = [nil, nil]
assert( a.none? )
a = [false, false]
assert( a.none? )
a = [true, false]
assert( ! a.none? )
a = [nil, 1]
assert( ! a.none? )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems