Coffee script
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CoffeeScript is a programming language created by Jeremy Ashkenas that transpires to JavaScript. It aims to enhance JavaScript with syntax sugar like lambda functions, list comprehensions, and class definitions. CoffeeScript code reads like English and removes unnecessary characters like semicolons and parentheses from JavaScript. Classes in CoffeeScript are based on JavaScript's prototype-based inheritance, and new objects created with the new keyword link to the class's prototype for property lookup.
Coffee script
- 2. CoffeeScript created by Jeremy Backbone.js transpile to ES5 Syntax Sugar adopted by node.js Ruby
- 3. Less is More var ; () {}
- 4. Lambda (arrow) Callback function is simple.
- 6. Comprehension if, for generates list list.filter(item != 2).map(item => print item) for (item <- list; item != 2) yield print item
- 7. Operator Alias Write codes like speaking English. on, yes -> true is -> ===
- 8. Class class Car name: “Prius” mycar: -> console.log “My car is #{@name}” c1 = new Car() c1.mycar() // “My car is Prius”
- 9. Prototype base class : JS class is based on prototype based OOP
- 10. Prototype Property {}c1 = new Car() new create a blank object {} and a link to Car.prototype Car = function() { // prototype is created implicitly } Car.prototype.name = “Prius” c1.name Prototype Chain look up prototype.name if name does not exist.
- 11. this c1 = new Car() { name : “Prius”, mycar : function()… } Car = function() { this.name = “Prius” this.mycar = function() } Window.name = “Prius” c2 = new Car() { name : “Prius”, mycar : function()… } c3 = Car()
- 12. Copy on write Car.prototype c1 = new Car() {name : “Prius x”} { name : “Porche”, mycar : function()… } c1.name = “Prius x” {} c2 = new Car() creates a prop name in c1