Example: Rails-style date/time helpers in CoffeeScript

date_time.coffee

Number::seconds = ->
  @ * 1000
  
Number::minutes = ->
  @seconds() * 60
  
Number::minute = Number::minutes
  
Number::hours = ->
  @minutes() * 60
  
Number::hour = Number::hours

Number::ago = ->
  new Date(new Date().valueOf() - @)
  
Number::from_now = ->
  new Date(new Date().valueOf() + @)
  
console.log 2.seconds()
console.log new Date()
console.log 2.seconds().ago()
console.log 10.seconds().from_now()
console.log 1.minutes().from_now()
console.log 1.hours().from_now()
console.log 1.hour().from_now()
console.log 1.hour().ago()

date_time.js

Number.prototype.seconds = function() {
  return this * 1000;
};
Number.prototype.minutes = function() {
  return this.seconds() * 60;
};
Number.prototype.minute = Number.prototype.minutes;
Number.prototype.hours = function() {
  return this.minutes() * 60;
};
Number.prototype.hour = Number.prototype.hours;
Number.prototype.ago = function() {
  return new Date(new Date().valueOf() - this);
};
Number.prototype.from_now = function() {
  return new Date(new Date().valueOf() + this);
};
console.log((2).seconds());
console.log(new Date());
console.log((2).seconds().ago());
console.log((10).seconds().from_now());
console.log((1).minutes().from_now());
console.log((1).hours().from_now());
console.log((1).hour().from_now());
console.log((1).hour().ago());

Looks nice, but you don't have to put () in front of a function that expects no arguments. Just -> will do nicely.

Good tip. Thanks.