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Introduction to Dart
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Introduction to Dart

Introduction to Dart

1. First Acquaintance with Dart
About DartFirst ApplicationFunction print()CommentsBasic Math Operations
2. Variables and Data Types
Data TypesVariablesProperties of NumbersBool, Equality and Relational Operators
3. Conditional Statements
if Statementif...else Statementelse-if Statementswitch-sase Statement
4. List and String
ListIndexesStringWhat are Methods?String Properties and Methods
5. Loops
Introduction to Loopswhile-LoopsDo-whilefor-LoopsIncrement and DecrementBreak and Continue

bookString

String

In Dart, string values can be represented using either single or double quotes. Single-line strings are represented using single or double quotes, while triple quotes are employed to represent multi-line strings.

dart

main

copy

              
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String variable_name = 'value'  

String variable_name = "value"  

String variable_name = '''line1 
line2'''   

String variable_name = """line1 
Line2"""

Variable in String

In Dart, you can insert the value of a variable of any data type into the middle of a String.

Inserting variables into a String is essential for the following reasons:

  • Readability and Editing Convenience: It makes the code more understandable and user-friendly, especially when you need to incorporate variable values within a String. Instead of complex string concatenation, you can easily include them in the String using special syntax;
  • Error Avoidance: Using String interpolation helps prevent errors during string join and ensures the correct insertion of variable values, taking their data types into account;
  • Linguistic Flexibility: You can seamlessly combine text and variable values within strings, allowing for the creation of more dynamic and adaptable messages and strings.

These benefits enhance code clarity, reduce the likelihood of mistakes, and provide flexibility for creating engaging and comprehensible code.

dart

main

copy

              
1234

            
void main() { 
   int age = 22; 
   print("Me ${age} years"); 
}
  • age - Variable;
  • ${} - A construction that will allow inserting to string the value from a variable.

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Seção 4. Capítulo 3
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