Data Type for Flutter in Dart

Suraj Chauhan

30 September 2024

In this blog we will learn about data types for Flutter in Dart. Data types are fundamental building blocks for managing and manipulating data.

Introduction

Dart, the programming language used for Flutter development, and it support a set of data types that help developers manage data efficiently.

Data types are essential for handling different kinds of information. Knowing how to use these data types helps you manage data effectively when building apps.

Type of Data type

There are multiple type of data type in flutter which is mention below.

1. Numeric Data Type:

Dart provides two primary numeric types to handle numbers: int and double. Each serves different purposes and has its own characteristics.

int:-> Represents integer values, which are whole numbers without any decimal point.
double:->Represents floating-point numbers, which can contain decimal points.

// Int
int age = 30;
int temperature = -5;

//Double

double pi = 3.14;
double temperature = -10.5;

// Int

int age = 30;

int temperature = -5;

//Double

double pi = 3.14;

double temperature = -10.5;

2. String Data Type:

In Dart, strings are used to represent sequences of characters, such as text. They are a fundamental data type and are widely used in applications for displaying messages, processing user input, and handling textual data.

String greeting = 'Hello, Webkul';

1	String greeting = 'Hello, Webkul';

3. Booleans Data Type:

In Dart, the boolean data type is represented by the bool keyword and is used to store truth values: either true or false.

bool isActive = true;
bool hasPermission = false;

1 2	bool isActive = true; bool hasPermission = false;

4. Lists Data Type:

Lists in Dart are an ordered collection of items, allowing you to store multiple values in a single variable. They are flexible, versatile, and a fundamental data structure in Dart programming.

List<int> numbers = [1, 2, 3, 4, 5];
List<String> fruits = ['apple', 'banana', 'cherry'];

1 2	List<int> numbers = [1, 2, 3, 4, 5]; List<String> fruits = ['apple', 'banana', 'cherry'];

You can create a list using square brackets ([]). Lists can hold items of any data type, including integers, strings, objects, etc.

5. Sets Data Type:

A Set in Dart is an unordered collection of unique items. It is used when you want to store values without duplicates and do not care about the order of the elements.

You can create a Set using curly braces {} or the Set constructor.

var mySet = {1, 2, 3};

//Using the Set Constructor:
var mySet = Set<int>();

//Add and element

mySet.add(4);

//Remove element

mySet.remove(2);

//Print Over All Set

for (var item in mySet) {
  print(item);
}

Output

1,3,4

var mySet = {1, 2, 3};

//Using the Set Constructor:

var mySet = Set<int>();

//Add and element

mySet.add(4);

//Remove element

mySet.remove(2);

//Print Over All Set

for (var item in mySet) {

print(item);

}

Output

1,3,4

6. Map Data Type:

In Dart, a Map is a collection of key-value pairs, where each key is unique. Maps are useful for storing and retrieving data based on a specific key.

var myMap = {'name': 'Suraj', 'age': '24'};

myMap.forEach((key, value) {
  print('$key: $value');
});

Output

name: Suraj
age: 24

var myMap = {'name': 'Suraj', 'age': '24'};

myMap.forEach((key, value) {

print('$key: $value');

});

Output

name: Suraj

age: 24

Conclusion

In this blog we have discussed about Data Type for Flutter in Dart.

I hope this blog is helpful to UnderStand this topic, you can visit here for more knowledge about datatype.
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