Ruby/Method/Variable Number Arguments

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Содержание

A variable number of arguments stored in an array.

def num_args( *args )
  length = args.size
  label = length == 1 ? " argument" : " arguments"
  num = length.to_s + label + " ( " + args.inspect + " )"
  num
end
puts num_args
puts num_args(1)
puts num_args( 100, 2.5, "three" )



Mixed parameters and varied length parameter

#!/usr/bin/env ruby
def two_plus( one, two, *args )
  length = args.size
  label = length == 1 ? " variable argument" : " variable arguments"
  num = length.to_s + label + " (" + args.inspect + ")"
  num
end
puts two_plus( 1, 2 )
puts two_plus( 1000, 3.5, 14.3 )
puts two_plus( 100, 2.5, "three", 70, 14.3 )



Passing a Variable Number of Arguments

def putter(first_word, *others)
  puts first_word + " " + others.join(" ")
end
putter "Hello", "from", "Ruby."



prefixing the array with an asterisk

array = ["there ", "AAA"]
def putter(first_word, second_word, third_word)
  puts first_word + " " + second_word + " " + third_word
end
putter "Hello ", *array



Variable Arguments

def num_args( *args )
  length = args.size
  label = length == 1 ? " argument" : " arguments"
  num = length.to_s + label + " ( " + args.inspect + " )"
  num
end
puts num_args
puts num_args(1)
puts num_args( 100, 2.5, "three" )
Источник — «http://www.wiki.crossplatform.ru/index.php/Ruby/Method/Variable_Number_Arguments»