The document presents an introduction to Dart, an open-source programming language suitable for developing one-page web applications that bridges JavaScript's dynamic typing and Java/C#'s static typing. It discusses Dart's object-oriented features, functional programming capabilities, JavaScript interoperability, and the usage of the Dart package manager, 'pub,' for code management. Additionally, it highlights some criticisms of Dart regarding potential vendor lock-in and code quality due to optional typing.

1. Haim Michael
October 9th, 2013
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Watch the lecture at http://youtu.be/4g3U6MZc92Q
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Dart Jump Start

2. ●
Introduction
●
Optional Typing
●
Object Oriented Programming
●
Functional Programming
●
JavaScript Interoperability
●
Dart Packages Manager
●
Dart Evolution
●
Dart Criticism
●
Learning Resources
●
Questions & Answers
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Table of Content

3. ●
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.
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Introduction

4. ●
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 JavaPHPC#.
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Introduction

5. ●
The Dart programming language bridges the gap between the
JavaScript dynamic type system and the JavaC# 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");
}
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Optional Typing

6. ●
The Dart programming language uses classes and interfaces
●
similarly to Java, C# and PHP.
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Dart supports single inheritance similarly to Java, C# and PHP.
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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.
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Object Oriented Programming

7. ●
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#
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Object Oriented Programming

8. 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);
}
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Object Oriented Programming

9. 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");
}
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Object Oriented Programming

10. ●
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.
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Functional Programming

11. 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");
}
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Functional Programming

12. ●
Dart allows us to interact with other parts of the web
document as the DOM and other code written in
JavaScript.
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JavaScript Interoperability

13. 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();
}
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JavaScript Interoperability

14. ●
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
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Dart Package Manager

15. ●
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.
Polymer
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Dart Evolution

16. “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
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Dart Criticism

17. ●
Dart programming language official main website
https://www.dartlang.org
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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/
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Learning Resources

18. ●
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.
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Questions & Answers