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Contents
module Vedeu
# Take a collection of words (elements) and form a sentence from them.
#
# @example
# elements = ['Hydrogen', 'Helium', 'Lithium']
# Vedeu::Sentence.construct(elements) # => 'Hydrogen, Helium and Lithium'
#
class Sentence
class << self
# @param elements [Array]
# @param label [String]
# @return [String]
def construct(elements, label = 'elements')
new(elements, label).construct
end
end
# @param elements [Array]
# @param label [String]
# @return [Vedeu::Sentence]
def initialize(elements, label)
@elements, @label = elements, label
end
# @return [String]
def construct
if one?
first
elsif two?
elements.join(' and ')
elsif many?
[but_last, last].join(' and ')
else
"No #{label} have been assigned."
end
end
private
attr_reader :elements, :label
# @return [Boolean]
def one?
count == 1
end
# @return [Boolean]
def two?
count == 2
end
# @return [Boolean]
def many?
count > 2
end
# @return [String]
def but_last
elements[0...-1].join(', ')
end
# @return [String]
def first
elements.first
end
# @return [String]
def last
elements[-1]
end
# @return [Fixnum]
def count
elements.size
end
end # Sentence
end # Vedeu
Version data entries
8 entries across 8 versions & 1 rubygems