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Introduction to Dart

bookData Types in Dart

Dart supports different data types for different tasks. Like in life, we use words to communicate and numbers to calculate. Dart allows us to use numbers for mathematical operations:

main.dart

main.dart

copy

              
123

            
void main() {
  print(22 + 33);
}

In Dart, you can join strings:

main.dart

main.dart

copy

              
123

            
void main() {
  print("Name " + "Alex");
}

You can use the bool data type to print whether a statement is true or false:

main.dart

main.dart

copy

              
1234

            
void main() {
  print(true);
  print(false);
}

For example, you can perform mathematical operations between int and double because both are numbers.

Note
Note

Both int and double represent numbers. Use int for whole values like counts or years, and double for values with decimals such as prices or measurements.

However, you cannot add a String to an int or double because a String is simply a sequence of characters.

main.dart

main.dart

copy

              
123

            
void main() {
  print("String example " + 44);
}
question mark

Find the line of code with the error.

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 1

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bookData Types in Dart

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Dart supports different data types for different tasks. Like in life, we use words to communicate and numbers to calculate. Dart allows us to use numbers for mathematical operations:

main.dart

main.dart

copy

              
123

            
void main() {
  print(22 + 33);
}

In Dart, you can join strings:

main.dart

main.dart

copy

              
123

            
void main() {
  print("Name " + "Alex");
}

You can use the bool data type to print whether a statement is true or false:

main.dart

main.dart

copy

              
1234

            
void main() {
  print(true);
  print(false);
}

For example, you can perform mathematical operations between int and double because both are numbers.

Note
Note

Both int and double represent numbers. Use int for whole values like counts or years, and double for values with decimals such as prices or measurements.

However, you cannot add a String to an int or double because a String is simply a sequence of characters.

main.dart

main.dart

copy

              
123

            
void main() {
  print("String example " + 44);
}
question mark

Find the line of code with the error.

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 1
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