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Introduction to Dart
course content

Зміст курсу

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

bookif...else Statement

if...else Statement

An if can be followed by an optional else block. The else block will execute if the Boolean expression tested by the if block evaluates to false.

Example

dart

main

copy

              
12345678

            
void main() {
  int age = 17;
  if (age >= 18) {
    print("You're an adult");
  } else {
    print("You're not an adult yet.");
  }
}

In the example above, the age < 18, so the if code block hasn't been executed. The else code block executes when the if condition is false.

The else syntax is like the if syntax without a condition and parentheses ( )

Task

Write a condition for the if statement to check whether the variable is of type int.

dart

main

copy

              
12345678

            
void main() {
  var num = 7.0;
  if(___){
    print('Type: int');
  } else {
    print('Type: other type');
  }
}

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