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Contents
# = Array Padding Extensions
#
# Padding extensions for Array.
#
class Array
# CREDIT Richard Laugesen
# Pad an array with a given <tt>value</tt> upto a given <tt>length</tt>.
#
# [0,1,2].pad(6,"a") #=> [0,1,2,"a","a","a"]
#
# If <tt>length</tt> is a negative number padding will be added
# to the beginning of the array.
#
# [0,1,2].pad(-6,"a") #=> ["a","a","a",0,1,2]
def pad(len, val=nil)
return dup if self.size >= len.abs
if len < 0
Array.new((len+size).abs,val) + self
else
self + Array.new(len-size,val)
end
end
# Like #pad but changes the array in place.
#
# a = [0,1,2]
# a.pad!(6,"x")
# a #=> [0,1,2,"x","x","x"]
def pad!(len, val=nil)
return self if self.size >= len.abs
if len < 0
replace Array.new((len+size).abs,val) + self
else
concat Array.new(len-size,val)
end
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestArray < Test::Unit::TestCase
def test_pad
r = [0,1,2,3].pad(7,"x")
x = [0,1,2,3,"x","x","x"]
assert_equal(x,r)
end
def test_pad!
a = [0,1,2,3]
r = a.pad!(6,"y")
x = [0,1,2,3,"y","y"]
assert_equal(x,a)
end
def test_pad_negative
r = [0,1,2,3].pad(-7,"n")
x = ["n","n","n",0,1,2,3]
assert_equal(x,r)
end
def test_pad_negative!
a = [0,1,2,3]
r = a.pad!(-6,"q")
x = ["q","q",0,1,2,3]
assert_equal(x,a)
end
end
=end
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