Unit variable types_Dart_Presentation.pptx

1. Variables, Data Types &
Operators in Dart
A Practical Guide for Beginners

2. Introduction
• • Explore variables, data types, and operators
in Dart.
• • Fundamental concepts for robust
applications.

3. Declaring Variables
• • Use `var` keyword to declare variables.
• Example: var message = "Hello, Dart!";

4. Different Data Types
• • Integers: int score = 42;
• • Strings: String name = "John";
• • Booleans: bool isRaining = true;
• • Lists: List<int> numbers = [1, 2, 3];
• • Maps: Map<String, int> ages = {"Alice": 25,
"Bob": 30};

5. Type Inference & Explicit Types
• • var age = 23; // Type inferred as int
• • String name = "Alice"; // Explicit type
declaration

6. Constants & Final Variables
• • const PI = 3.14159; // Compile-time constant
• • final appName = "My App"; // Runtime
constant

7. Arithmetic Operators
• • +, -, *, /, %
• Example: int sum = a + b;

8. Comparison Operators
• • ==, !=, <, >, <=, >=
• Example: bool isEqual = a == b;

9. Logical Operators
• • && (AND), || (OR), ! (NOT)
• Example: bool result = isTrue && isFalse;

10. String Methods
• • length, toUpperCase(), toLowerCase(),
substring()
• Example: message.substring(0, 5);

11. Conclusion
• • Learned about Dart variables, data types,
and operators.
• • Explored constants, final variables, and
string manipulation.