Extending Built-in Objects in CoffeeScript

extend_built_in_objects.coffee

# Use :: to assign your new function to the prototype of the object or class.
# Maintainable JavaScript: Don’t modify objects you don’t own; Extending built-in native objects. Evil or not?
# http://www.slideshare.net/nzakas/maintainable-javascript-1071179

unless String::trim then String::trim = -> @replace /^\s+|\s+$/g, ""

String::strip = -> if String::trim? then @trim() else @replace /^\s+|\s+$/g, ""
String::lstrip = -> @replace /^\s+/g, ""
String::rstrip = -> @replace /\s+$/g, ""


"  padded string  ".trim()
# => 'padded string'

"  padded string  ".strip()
# => 'padded string'
"  padded string  ".lstrip()
# => 'padded string  '
"  padded string  ".rstrip()
# => '  padded string'