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Contents
#!/usr/local/bin/ruby -w
#
# == extensions/array.rb
#
# Adds methods to the builtin Array class.
#
require "extensions/_base"
#
# * Array#select!
#
ExtensionsProject.implement(Array, :select!) do
class Array
#
# In-place version of Array#select. (Counterpart to, and opposite of, the
# built-in #reject!)
#
def select!
reject! { |e| not yield(e) }
end
end
end
#
# * Array#only
#
ExtensionsProject.implement(Array, :only) do
class Array
#
# Returns the _only_ element in the array. Raises an IndexError if the array's size is not
# 1.
#
# [5].only # -> 5
# [1,2,3].only # -> IndexError
# [].only # -> IndexError
#
def only
unless size == 1
raise IndexError, "Array#only called on non-single-element array"
end
first
end
end
end
#
# * Array#rand
#
ExtensionsProject.implement(Array, :rand) do
class Array
#
# Return a randomly-chosen (using Kernel.rand) element from the array.
#
# arr = [48, 71, 3, 39, 15]
# arr.rand # -> 71
# arr.rand # -> 39
# arr.rand # -> 48
# # etc.
#
def rand
idx = Kernel.rand(size)
at(idx)
end
end
end
Version data entries
18 entries across 18 versions & 4 rubygems