Dart Variables:

A variable is a name to allocate memory, where the user stores the data and it can be accessed whenever requires, with the help of a variable by calling the declared variable name. There are different types of variables that are used to assign or store the data. The type of the variable depends upon the type which we're going to store or use.

One point we should consider while declaring a variable is, Whenever any initial value of a variable is not declared, It is assumed to be null no matter what kind of data type it is.

Dart Uses var as a keyword while declaring a variable.

Ex var name = 'Aditya';

Things we need to consider while declaring a variable

1. Declaring a keyword is not allowed

2. Space between characters is not allowed

3. The name of the variable can't begin with a number

4. It can be alphanumeric

5. Special characters are not allowed except Underscore ( _ ) & Dollar( $ )

Types of Variables

1. String

2. Integer

3. double

4. Booleans

5. Collections

6. final & const

Note: Float is not available in dart it is replaced with a double.

String

The sequence of characters, which uses for declaring a text. Strings in dart can be multiple or single lines. A string can be declared in double or single quotes.

// this is a single quote declaration

String singleQuote = 'Aditya';

// this is a double quote declaration

String doubleQuote = "Aditya";

most of the time we go with a single quote declaration.

for combining a string we can use the + operator,

Ex String a = 'Learn';

String b = ' to win';

String c = a+b;

print(c);

Here is the result

// Learn to win

Integer

For declaring numerical's other than decimal numbers we use Integer (int) as the data type

Ex

int a = 5;

int b = 3;

print('Summation of a & b is.....${a+b}');

// Output: Summation of a & b is.....8

Double

Declaring of decimal numbers can be handled via a double.

Ex

double a = 5.2;

double b = 3.3;

print('Multiplication of a & b is.....${a*b}');

// Output: Multiplication of a & b is.....17.16

Booleans

For applying a condition we use booleans. it supports two types of literals they are true and false. it can be declared as bool

Ex

bool var_true = true;

bool var_false = false;

Collections

For Collections please refer to this page for detailed elaboration.

https://www.aditya.win/learn-flutter/dart-programming/collections

Final & Const