Mobile Application Development Lecture 2

Mobile Application Development Lecture 2

• The lecture is titled "Mobile Application Development, Lec. 2" and presented by Dr. Samah Adel.

Why Use Dart

• Dart is an open-source, general-purpose programming language developed by Google.
• It supports application development on client and server sides, including Android, iOS, IoT, and web applications.
• It's used primarily with the Flutter Framework.
• Dart compiles to native code for fast performance, ideal for mobile apps.
• Dart is relatively easy to learn, similar to Java or JavaScript.
• Dart is the core of Flutter, a framework for building beautiful and functional mobile applications.
• Flutter allows developers to create mobile, web, and desktop applications with a single codebase.

Features of Dart Programming Language

• Dart is easy to understand due to its code reuse features.
• It uses Object-Oriented Programming principles, similar to Java and C++.
• It's open-source, making it popular among developers and organizations.
• It's supported by most modern web browsers using the dart2js compiler, converting Dart to JavaScript.
• It's type-safe, combining static and runtime checks to ensure variable types match.
• It supports both just-in-time (JIT) and ahead-of-time (AOT) compilation.
• Dart2js adds value to this by providing advanced compilation.
• Dart supports asynchronous programming, allowing programs to respond to multiple tasks concurrently.

Hello World Program

• The main() function in Dart is the program's entry point.
• The statement main() { ... } defines the main function, where the program begins execution.
• The print() function displays output during compilation. print("Hello World! Hello Dart");

Comments

• Dart supports single-line and multiline comments.
• Single-line comments start with //.
• Multiline comments use /* */.
• Documentation comments start with ///.

Variables

• Static Variables: Declared with a specific data type. For example: int variableName;
• Dynamic Variables: Declared without a specific data type (using var). Example: var variableName;
• Final/Const: These variables can only be initialized once and their values cannot be changed.

Dynamic Type Variable in Dart

• dynamic great = "Good Morning"; //Dynamic variables are initialized without specifying the data type.
• Using var instead of dynamic results in an error.

Final And Const Keyword in Dart

• final variables can only be initialized once. They are initialized when accessed.
• const variables are compile-time constants.

Null Safety in Dart

• By default, Dart variables can't be assigned null values before they are explicitly defined as accepting null.
• int? a; declares a nullable integer variable.
• Variables declared as nullable can be assigned null.

Operators

• Various types of operators (arithmetic, relational, type test, bitwise, assignment, logical, and conditional) are available in Dart.

Arithmetic Operators

• Dart supports standard arithmetic operations (+, −, *, /, %, ~/).

Relational Operators

• Dart supports relational operators (>, <, >=, <=, ==, !=).

Type Test Operators

• Dart has is and is! operators to check the data type of an object.

Bitwise Operators

• Dart supports bitwise operators (&, |, ^, ~, <<, >>).

Assignment Operators

• Dart's assignment operators include the standard assignment operator (=) and others providing shorthand notation.
• The ??= operator assigns a value only if the variable is null.

Logical Operators

• Dart provides logical operators (&&, ||, !).
• These perform logical operations on boolean expressions.

Conditional Operators

• Dart's conditional operators (condition ? expression1 : expression2 and expersion1 ?? expression2) provide concise ways to execute different code paths based on conditions or avoid null errors

Standard Input Output

• Dart's stdin.readLineSync() method allows reading input from the console.
• The dart:io library is imported to use console input.
• The stdout.write() method is used to display output to the console.

Data Types in Dart

• Different data types like Numbers, Strings, Booleans, Lists, and Maps are supported.
• Each data type has its own specific characteristics and uses.

This quiz covers Lecture 2 of Mobile Application Development presented by Dr. Samah Adel. Explore the features and advantages of the Dart programming language, especially in conjunction with the Flutter Framework for building mobile and web applications. Learn why Dart is becoming a popular choice among developers.