ES6-like string functions (they are not really compatible - like not at all - to the official specification though)

gistfile1.coffee

do (String) ->
  String::contains or= (searchString, position = 0) -> @toString().indexOf(searchString) >= position
  String::startsWith or= (searchString, position = 0) -> @toString.toString().indexOf(searchString) >= position
  String::endsWith or= (searchString, position = @length) -> @toString().lastIndexOf(searchString) is position - searchString.length
  String::repeat or= (count) ->
    newString = ''
    newString += @toString() for [1..count]
    newString
  String::toArray or= -> @toString().split ''
  String::reverse or= -> @toArray().reverse().join ''