Class: Array

Inherits:

Object

• Object
• Array

Defined in:

lib/arrayextension.rb

Overview

The Ruby class Array is extended with a few useful methods.

Instance Method Summary

• #draw(number_of_elements = 1) ⇒ Object

  Returns an array containing elements choosen at random.

• #join_cr ⇒ Object

  Returns a string created by converting each element of the array to a string, separated by n.

Instance Method Details

#draw(number_of_elements = 1) ⇒ Object

Returns an array containing elements choosen at random

[].draw                     #=> []
[].draw(2)                  #=> []
["a"].draw(2)               #=> ["a", "a"]
["a", "b", "c"].draw        #=> ["b"] assuming "b" was choosen randomly
["a", "b", "c"].draw(2)     #=> ["b", "c"] assuming "b" and "c" were choosen randomly

# File 'lib/arrayextension.rb', line 23

def draw(number_of_elements = 1)
  return [] if empty?
  (1..number_of_elements).to_a.map { random_element }
end

#join_cr ⇒ Object

Returns a string created by converting each element of the array to a string, separated by n

[].join_cr                  #=> ""
["a"].join_cr               #=> "a"
["a", "b", "c"].join_cr     #=> "a\nb\nc\n"

# File 'lib/arrayextension.rb', line 11

def join_cr
  self.compact.reject { |element| element.to_s.empty? || element.to_s.strip == "\n" }.join("\n")
end