What are the data types in Dart?
Maria ElijahWhen a variable is created in Dart, it has an associated data type, just like in other languages (C, Python, Java).
Data types for a variable specifies the following:
- The amount of space to be allocated
- Possible values
- The operation to be performed on the variable
Dart is a programming language that is statically typed; this means that variables always have the same type, which cannot be changed.
Data types in Dart programming are given below:
- Numbers
- Strings
- Booleans
- Lists
- Maps
Numbers
In Dart, numbers are used to represent numeric literals. Dart numbers are grouped into two types:
-
Integer: represents non-fractional numbers (whole numbers). Integers can be declared with the
intkeyword. -
Double: represents fractional numbers (floating-point numbers). Doubles can be declared with the
doublekeyword.
void main() {
//declare a integer value
int num1 = 1;
// declare a double value
double num2 = 1.5;
print(num1);
print(num2);
}Strings
A string represents string literals and is a sequence of characters. A string is declared with the String keyword.
void main() {
String str = 'Educative';
print(str);
}Booleans
A boolean represents true and false values. It is declared with the bool keyword.
void main() {
bool val = true;
print(val);
}Lists
A list is used to represent a collection of objects. It is similar to the concept of an array in other programming languages. A list is a group of ordered objects.
void main()
{
List shot = List(3);
shot[0] = 'Data types';
shot[1] = 'in';
shot[2] = 'Dart';
print(shot);
// access the first index
print(shot[0]);
} Maps
A map is a dynamic collection that represents a set of values as key-value pairs. Keys and values on a map may be of any type.
void main()
{
Map shot = Map();
shot['0'] = 'Data types';
shot['Second'] = 'in';
shot['a'] = 'Dart';
print(shot);
} RELATED TAGS
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