Sha256: 3ca923172b6cf0b5463dc780b5a12a150bdaa5283c3dbebf63c48a2837bc9aba
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Versions: 18
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Contents
#--
# Author:: Lance Ivy
# Copyright:: Copyright (c) 2007 QualitySmith, Inc.
# License:: Ruby License
# Submit to Facets?:: Not sure.
#++
class Array
=begin rdoc
Returns the value previous to the given value. The value previous to the first is the last. Returns nil if the given value is not in the array.
Example:
sequence = ['a', 'b', 'c']
sequence.before('a') => 'c'
sequence.before('b') => 'a'
sequence.before('c') => 'b'
sequence.before('d') => nil
=end
def before(value)
return nil unless include? value
self[(index(value).to_i - 1) % length]
end
=begin rdoc
Returns the value after the given value. The value before the last is the first. Returns nil if the given value is not in the array.
Example:
sequence = ['a', 'b', 'c']
sequence.after('a') => 'b'
sequence.after('b') => 'c'
sequence.after('c') => 'a'
sequence.after('d') => nil
=end
def after(value)
return nil unless include? value
self[(index(value).to_i + 1) % length]
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
class TheTest < Test::Unit::TestCase
def setup
@sequence = ['a', 'b', 'c']
end
def test_before
assert_equal 'c', @sequence.before('a')
assert_equal 'a', @sequence.before('b')
assert_equal 'b', @sequence.before('c')
assert_equal nil, @sequence.before('d')
end
def test_after
assert_equal 'b', @sequence.after('a')
assert_equal 'c', @sequence.after('b')
assert_equal 'a', @sequence.after('c')
assert_equal nil, @sequence.after('d')
end
end
=end
Version data entries
18 entries across 18 versions & 2 rubygems