Javascript Array toSentence()

to_sentence.js.coffee

Array.prototype.toSentence = (oxfordComma) ->
  firstWord = if typeof this[0] is 'string' then this[0].charAt(0).toUpperCase() + this[0].slice(1) else this[0]

  conjunction = if oxfordComma then ', and' else ' and'

  switch @length
    when 0 then ''
    when 1 then "#{firstWord}."
    when 2 then "#{firstWord} and #{this[1]}."
    else "#{firstWord}, #{@slice(1, -1).join(', ')}#{conjunction} #{this[@length - 1]}."