JavaScript equivalent of Array#to_sentence from Rails

gistfile1.js

Array.prototype.to_sentence = function() {
  return this.join(", ").replace(/,\s([^,]+)$/, ' and $1')
}

If you like oxford commas (my team at work does), you can do this instead:

Array.prototype.toSeries = function() {
  if this.length == 2 {
    return this.join(' and ');
  }
  return this.join(', ').replace(/,\s([^,]+)$/, ', and $1');
}

I also changed the name to toSeries because I disagree with rails about the name.

Coffeescript version:

Array::toSeries = -> if @length == 2 then @join(' and ') else @join(', ').replace(/,\s([^,]+)$/, ', and $1')