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Contents
# TITLE:
#
# String NChar
#
# SUMMARY:
#
# String extensions for accessing and manipulating
# a front or end number of characters.
#
# AUTHORS:
#
# - Thomas Sawyer
#
class String
# CREDIT Lucas Carlson and Blaine Cook
#
def starts_with?(prefix)
self.index(prefix) == 0
end
#
def ends_with?(suffix)
self.rindex(suffix) == size - suffix.size
end
# Retrns _n_ characters of the string. If _n_ is positive
# the characters are from the beginning of the string.
# If _n_ is negative from the end of the string.
#
# Alternatively a replacement string can be given, which will
# replace the _n_ characters.
#
def nchar(n, replacement=nil)
if replacement
s = self.dup
n > 0 ? (s[0...n] = replacement) : (s[n..-1] = replacement)
return s
else
n > 0 ? self[0...n] : self[n..-1]
end
end
#
def lchomp!(match)
if index(match) == 0
self[0...match.size] = ''
self
end
end
#
def lchomp(match)
if index(match) == 0
self[match.size..-1]
else
self.dup
end
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestStringIndex < Test::Unit::TestCase
def test_nchar
assert_equal( "abc", "abcxyz".nchar(3) )
assert_equal( "xyz", "abcxyz".nchar(-3) )
assert_equal( "HIxyz", "abcxyz".nchar(3, 'HI') )
assert_equal( "abcHI", "abcxyz".nchar(-3, 'HI') )
end
end
=end
Version data entries
10 entries across 10 versions & 1 rubygems