Last session of the day by Venkat on the power of Javascript
Javascript
Feels like Java & C
Similar to perl in some ways
Untyped Language
Rules
1) Case sensitive
2) goo idea to use ;
3) commenting style is same as Java/C++
4) null and undefined are used to indicated null
5) Strings are single or doule quotes and are immutable
Functional in nature : Functions are first class citizens
Pass and return functions. Everything should be object oriented is a wrong notion.
Variables are typeless. but you need to declare variables with var
Global and local scoping for variables. No block level.
Control structures are like C : statements, expressions, for loops
var sayHello = function(name) {
print('hi');
}
sayHello is now a handle to a function.Its powerful since, you can now register them as event handlers.
IN Javascript everything is an expression. there is no statement as such.
Functions are Objects
function Car(year) {
this.year=year;
}
var myCar = new Car(2011);
print (myCar.year);
myCar is an instance of Car.
Encapsulation is not really about security. Its for code maintainence.
prototype is like a backpack. Any method not defined on object is routed to prototype.
Car.prototype.drive = function(dist) {
print('driving..);
this.miles += dist;
}
Car.prototype.tune = function() {print ('tune')};
print (myCar["year"]); --> you can use this instead of dot notation. You can dynamically recieve the parameter since its in a double quote.
Object is nothing but a collection (property holder).
It can be a function, object or a collection of properties
for (var prop in myCar.__proto__) {
print(prop + '\n');
}
Inheritance in Javascript
Composition is better than Inheritance. Ruby and Groovy have delegation (@delegate).
Javascript supports inheritance through method composition.
function Base() {
}
function Dervied() {
}
Derived.prototype = new Base();
Code Quality
jslint is a nice tool to check code quality.
You need to separate the logic from HTML page.
Overall it was an amazing session with good insights on JS
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