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Versions: 7
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Stored size: 1.02 KB
Contents
class Array
# 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.
#
# Examples
#
# sequence = ['a', 'b', 'c']
# sequence.before('a') #=> 'c'
# sequence.before('b') #=> 'a'
# sequence.before('c') #=> 'b'
# sequence.before('d') #=> nil
#
# CREDIT: Tyler Rick
def before(value)
return nil unless include? value
self[(index(value).to_i - 1) % length]
end
# 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.
#
# Examples
#
# sequence = ['a', 'b', 'c']
# sequence.after('a') #=> 'b'
# sequence.after('b') #=> 'c'
# sequence.after('c') #=> 'a'
# sequence.after('d') #=> nil
#
# CREDIT: Tyler Rick
def after(value)
return nil unless include? value
self[(index(value).to_i + 1) % length]
end
end
Version data entries
7 entries across 6 versions & 1 rubygems