Impara if...else Statement in Dart | Conditional Statements

This image illustrates the basic structure of a conditional statement in programming:

First, the code runs and a condition is checked. If the condition is true, the if block executes; if false, the else block runs. After that, the program continues with the next part of the code, allowing it to make decisions based on conditions.

if (condition)
{
    // Code block `if` condition is `true`
}
else
{
    // Code block `if` condition is `false`
}

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.

main.dart


              123456789101112
            
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 ( ).

You can also write a condition for the if statement to check whether the variable is of type int by using is operator.

main.dart


              123456789101112
            
void main() {
  var num = 7.0;
  
  if(num is int
  {
    print('Type: int');
  }
  else
  {
    print('Type: other type');
  }
}

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Sezione 3. Capitolo 2

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This image illustrates the basic structure of a conditional statement in programming:

if (condition)
{
    // Code block `if` condition is `true`
}
else
{
    // Code block `if` condition is `false`
}

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.

main.dart


              123456789101112
            
void main() {
  int age = 17;

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

You can also write a condition for the if statement to check whether the variable is of type int by using is operator.

main.dart


              123456789101112
            
void main() {
  var num = 7.0;
  
  if(num is int
  {
    print('Type: int');
  }
  else
  {
    print('Type: other type');
  }
}

Tutto è chiaro?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 2