JavaScript core

  • Types
  • Statements
  • Closure, scope
  • OOP
  • Debug (console, debugger, unit test)
  • Home work

What's next? js+browser

  • DOM (events, quering, shadow node)
  • setTimeout, setInterval, animation
  • Cookie, localStorage
  • AJAX
  • Feature detection (IE hell, shims, shivs)


Write once, run anywhere

Types

  • Number
    • parseFloat, parseInt, toFixed, Math
  • String
    • length, indexOf, localeCompare, match, replace, substr, 
      substring, toLowerCase
  • Boolean
  • Function
  • Object
    • null, JSON, constructor, toString, valueOf
  • Array
    • length, push, splice, indexOf, join, forEach, map  
  • undefined 

Statements

  • var
  • with
  • switch case break default
  • while do/while
  • for for/in continue break 
  • function return
  • if/else ?: &&|| ||
  • throw try catch finally


Closure and scope


var i = 1;
var handler;
handler = function(){console.log(i)};

//i=2;
handler();
Demo

Functional programing

  • Function returns function                                                                  
    var ids = list
  .filter(if("active"))
  .map(field("id"))
  .toArray();
    var sum = plus(4)(5);

OOP

Forget about functions: class, method, constructor

Class or constructor function

function Student(name, grade) {  this.name = name;  this.grade = grade;
}var s = new Student("Вася Пупкин", 5);
s.constructor == Student;s instanceof Student;

Methods

function Student(name, grade) {
  var self = this;
  this.name = name;
  this.grade = grade;
  this.sayHello = function() {
    console.log(getDisplayName());
  };
  function getDisplayName() {
    return self.name + ": " + self.grade;
  }
}
function Student(name, grade) {
  this.name = name;
  this.grade = grade;
}
Student.prototype.sayHello = function() {
  console.log(this._getDisplayName());
};
Student.prototype._getDisplayName = function() {
  return this.name + ": " + this.grade;
};

Static

function Student(name, grade) {
  this.name = name;
  this.grade = grade;
}Student.settings = {  nameCharLimit: 100};
Student.getAllStudents = function (){
  return [];};console.log(Student.settings.nameCharLimit);console.log(Student.getAllStudents());


Inheritance

function DummyStudent(name) {
  Student.apply(this, [name, 2]);
  this.idle = function () {
    console.log("Idling...");
  };
}
var d = new DummyStudent("Виктор Я...ч");
if(d.idle) { // Duck typing 
  d.idle();
}
function DummyStudent(name) {
  this.name = name;
  this.grade = 2;
}
DummyStudent.prototype = new Student();
DummyStudent.prototype.idle = function () {
  console.log("Idling...");
};
var d = new DummyStudent("Виктор Я...ч");
if(d instanceof DummyStudent) {
  d.idle();
}


Base method call

function GossipyStudent(name) {
  Student.apply(this, [name, 2]);
  var base = {
    sayHello : this.sayHello 
  };

  this.sayHello = function () {
    console.log("Bla bla bla ...");
    base.sayHello();
  };
}

var d = new GossipyStudent("Виктор X...o");
d.sayHello();
function GossipyStudent(name) {
  this.name = name;
  this.grade = 2;
}
GossipyStudent.prototype = new Student();
GossipyStudent.prototype.sayHello = function () {
  console.log("Bla bla bla ...");
  Student.prototype.sayHello.call(this);
};

var d = new GossipyStudent("Виктор X...o");
d.sayHello();

Debug

  • console (alert)
  • debugger
  • unit test
  • Forget about IntelliSense
  • Code-base is the best doc
    • You must get used to read any code
    • Don't use .min.js files during development

Home work

  • Орел-решка                                                                    
    var game = new HeadsOrTailsGame(); 
var name = game.name; // Орел-решка 
var result = game.play(); // 1 or 0
result = game.getPreviousResult(); // 1 or 0
  • Montser game
    var m = new Monster(2);
m.goLeft();
m.goDown();
var d = m.totalDistance();
var angle = m.direction(); // Direction angle


Base on:

  • http://www.slideshare.net/TelerikAcademy/15-java-script-in-depth
  • http://docstore.mik.ua/orelly/webprog/jscript/index.htm

JavaScript core

By Vladimir Gaevoy

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JavaScript core

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