Dart Jump Start

Haim MichaelOctober 9th, 2013

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Watch the lecture at http://youtu.be/4g3U6MZc92Q

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Table of ContentLi fe M

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m● Introduction ● Optional Typing● Object Oriented Programming● Functional Programming● JavaScript Interoperability● Dart Packages Manager ● Dart Evolution ● Dart Criticism● Learning Resources● Questions & Answers

IntroductionLi fe M

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m● Dart is an open source class based, object oriented,

optionally typed programming language that assists us

with the development of browser based one page web

applications.

● We can execute the code that should run on the client

side either by using a web browser that supports Dart or

by compiling our code into JavaScript.

IntroductionLi fe M

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m● We can execute our code on the server side by using the

Dart virtual machine.

● The syntax seems familiar both to those who are used to

JavaScript and to those who are used to Java\PHP\C#.

Optional TypingLi fe M

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m● The Dart programming language bridges the gap between the

JavaScript dynamic type system and the Java\C# static one.

● The optional typing is available in variable declarations, function

parameters definitions and function return types.

void main()

{

int a = 4;

int b = 3;

var temp = a + b;

print("temp=$temp");

}

Object Oriented ProgrammingLi fe M

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m● The Dart programming language uses classes and interfaces

● similarly to Java, C# and PHP.

● Dart supports single inheritance similarly to Java, C# and PHP.

● Dart supports multiple interfaces implementation similarly to

Java, C# and PHP.

● Similarly to Java, PHP and C# every class inherits (either

directly or indirectly) from the Object class.

Object Oriented ProgrammingLi fe M

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m● The classes can have public and private members. The

public accessibility is the default one.

● Dart supports a special shorthand syntax for accessing

class properties, similarly to properties in C#

Object Oriented ProgrammingLi fe M

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class Rectangle {

double _width; double _height; Rectangle(double w,double h) { width = w; height = h; } get width => _width; set width(size) => (size>0)?_width=size:_width=10.0; get height => _height; set height(size) => (size>0)?_height=size:_height=10.0; area() => width * height; perimeter() => 2*(width+height);}

Object Oriented ProgrammingLi fe M

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main() { var ob = new Rectangle(3.2,4.4); ob.width = 20.2; ob.height = -4.1; var area = ob.area(); print("area is $area");}

Functional ProgrammingLi fe M

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m● We can pass a function as an argument to another

function and we can assign a function to a variable.

● The possibility to define anonymous functions and pass

them over as arguments to other functions simplifies the

code.

Functional ProgrammingLi fe M

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goodMorning(str) => print("Good Morning $str");goodEvening(str) => print("Good Evening $str");

loop(func,name){

for(var i=1;i<=3;i++) { func(name); }}

main() { var myFunc = goodEvening; loop(myFunc,"Danidin");}

JavaScript InteroperabilityLi fe M

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m● Dart allows us to interact with other parts of the web

document as the DOM and other code written in

JavaScript.

JavaScript InteroperabilityLi fe M

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import 'dart:html';

void main() { var ob = query("#sample_text_id"); ob.text = "Press Here"; ob.on.click.add(reverseText);}

void reverseText(Event event) { var text = query("#sample_text_id").text; var buffer = new StringBuffer(); for (int i = text.length - 1; i >= 0; i--) { buffer.add(text[i]); } query("#sample_text_id").text = buffer.toString();}

Dart Package ManagerLi fe M

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m● Pub is Dart package manager. Pub assists us reusing

existing Dart code.

● Pub handles versioning and dependency management

and ensures that our application runs on other machines

exactly as it runs on ours.

http://pub.dartlang.org

Dart EvolutionLi fe M

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mPolymer

● Dart was announced on October 12th 2011. The

developers of Dart seem to learn well from Java

mistakes (waiting with the production release, proper

development tools and neutralizing competitors).

● During the past two years its development goes side by

side with the development of new Google powered

JavaScript libraries, such as AngularJS and Polymer.

Dart CriticismLi fe M

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m“The growth of Dart might take us backward to the days

of proprietary vendor lock-in"

“There is a fragmentation risk in the evolution of a new

non standard programming language for the web"

“The optional typing damages the quality of the code"

Critics I Found on The Web

Learning ResourcesLi fe M

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m● Dart programming language official main website

https://www.dartlang.org

● You can find the 'Dart Fundamentals' online course

available for free personal use at

http://abelski.lifemichael.com

● Dart Developers Group on Facebook

https://www.facebook.com/groups/221793191216903/

Questions & AnswersLi fe M

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m● Two courses you might find interesting include

Software Engineering in PHP

more info

Android 4.4 Java Applications Development

more info

HTML5 Cross Platform Mobile Applications

more info

● If you enjoyed my lecture please leave me a comment

at http://speakerpedia.com/speakers/life-michael.

Thanks for your time!

Haim.