Less ismorewithcoffeescript webdirectionsfeb2012

  • 1,117 views
Uploaded on

Slides from my lightning talk at Web Directions in Sydney, 23 February 2012. I wanted to demonstrate some of the ways CoffeeScript makes my life easier as a developer, by making my JavaScript code …

Slides from my lightning talk at Web Directions in Sydney, 23 February 2012. I wanted to demonstrate some of the ways CoffeeScript makes my life easier as a developer, by making my JavaScript code much faster and easier to read.

More in: Technology , Lifestyle
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
1,117
On Slideshare
0
From Embeds
0
Number of Embeds
1

Actions

Shares
Downloads
2
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Less is More with CoffeeScriptJo Cranford@jocranford
  • 2. Understanding Code 
  • 3. Writing Code  Modifying Code  Understanding Code 
  • 4. For Loop var i, weatherInCities; weatherInCities = []; for(i = 0; i < listOfCities.length; i++) { var city = listOfCities[i]; weatherInCities.push(city.name + ":" + city.weather); }
  • 5. For Loop var i, weatherInCities; weatherInCities = []; for(i = 0; i < listOfCities.length; i++) { var city = listOfCities[i]; weatherInCities.push(city.name + ":" + city.weather); }weatherInCities =(("#{city.name}: #{city.weather}") for city in listOfCities)
  • 6. For Loop var i, weatherInCities; weatherInCities = []; for(i = 0; i < listOfCities.length; i++) { var city = listOfCities[i]; weatherInCities.push(city.name + ":" + city.weather); }weatherInCities =(("#{city.name}: #{city.weather}") for city in listOfCities)
  • 7. For Loop var i, weatherInCities; weatherInCities = []; for(i = 0; i < listOfCities.length; i++) { var city = listOfCities[i]; weatherInCities.push(city.name + ":" + city.weather); }weatherInCities =(("#{city.name}: #{city.weather}") for city in listOfCities)
  • 8. For “Own” Loopvar objectToString = function (obj) { var key, val, _results; _results = []; for (key in obj) { if (!obj.hasOwnProperty(key)) continue; val = obj[key]; if (val !== null) _results.push(key + ":" + val); } return _results.join(",");};
  • 9. For “Own” Loopvar objectToString = function (obj) { var key, val, _results; _results = []; for (key in obj) { if (!obj.hasOwnProperty(key)) continue; val = obj[key]; if (val !== null) _results.push(key + ":" + val); } return _results.join(",");};objectToString = (obj) -> ("#{key}:#{val}" for own key, val of obj when val isnt null).join(“,")
  • 10. For “Own” Loopvar objectToString = function (obj) { var key, val, _results; _results = []; for (key in obj) { if (!obj.hasOwnProperty(key)) continue; val = obj[key]; if (val !== null) _results.push(key + ":" + val); } return _results.join(",");};objectToString = (obj) -> ("#{key}:#{val}" for own key, val of obj when val isnt null).join(“,")
  • 11. For “Own” Loopvar objectToString = function (obj) { var key, val, _results; _results = []; for (key in obj) { if (!obj.hasOwnProperty(key)) continue; val = obj[key]; if (val !== null) _results.push(key + ":" + val); } return _results.join(",");};objectToString = (obj) -> ("#{key}:#{val}" for own key, val of obj when val isnt null).join(“,")
  • 12. For “Own” Loopvar objectToString = function (obj) { var key, val, _results; _results = []; for (key in obj) { if (!obj.hasOwnProperty(key)) continue; val = obj[key]; if (val !== null) _results.push(key + ":" + val); } return _results.join(",");};objectToString = (obj) -> ("#{key}:#{val}" for own key, val of obj when val isnt null).join(“,")
  • 13. Constructor - JavaScript var Region = function(states) { this.states = states; }; Region.prototype.findStatesBeginningWith = function(letter) { var matchingStates = []; for (var i = 0;i < this.states.length; i++) { state = this.states[i]; if (state.substr(0,1) === letter) { matchingStates.push(state) } } return matchingStates; };
  • 14. Constructor - CoffeeScriptclass Region constructor: (@states) -> findStatesBeginningWith: (letter) -> state for state in @states when state.substr(0,1) is letter
  • 15. Constructor - CoffeeScriptclass Region constructor: (@states) -> findStatesBeginningWith: (letter) -> state for state in @states when state.substr(0,1) is letter
  • 16. Constructor - CoffeeScriptclass Region constructor: (@states) -> findStatesBeginningWith: (letter) -> state for state in @states when state.substr(0,1) is letter
  • 17. Constructor - CoffeeScriptclass Region constructor: (@states) -> findStatesBeginningWith: (letter) -> state for state in @states when state.substr(0,1) is letter
  • 18. Constructor - CoffeeScriptclass Region constructor: (@states) -> findStatesBeginningWith: (letter) -> state for state in @states when state.substr(0,1) is letter
  • 19. this and that var Clickable = function (baseElement) { var that = this; this.displayAlert = function() { alert("You just clicked me!"); }; $(baseElement).click(that.displayAlert); };
  • 20. this and that var Clickable = function (baseElement) { var that = this; this.displayAlert = function() { alert("You just clicked me!"); }; $(baseElement).click(that.displayAlert); };
  • 21. this and that var Clickable = function (baseElement) { var that = this; this.displayAlert = function() { alert("You just clicked me!"); }; $(baseElement).click(that.displayAlert); }; class window.Clickable constructor: (@baseElement) -> $(@baseElement).click(@displayAlert) displayAlert: => window.alert("You just clicked me!")
  • 22. this and that var Clickable = function (baseElement) { var that = this; this.displayAlert = function() { alert("You just clicked me!"); }; $(baseElement).click(that.displayAlert); }; class window.Clickable constructor: (@baseElement) -> $(@baseElement).click(@displayAlert) displayAlert: => window.alert("You just clicked me!")
  • 23. Average Lines Of Code 1.8X JavaScript CoffeeScript
  • 24. Writing CodeUnderstanding Code   Modifying Code 