Operators in Dart

Operators are used to perform mathematical and logical operations on the variables. Each operation in dart uses a symbol called the operator to denote the type of operation it performs. Before learning operators in the dart, you must understand the following things.

Operands : It represents the data. Operator It represents how the operands will be processed to produce a value.

Note

Suppose the given expression is 2 + 3. Here 2 and 3 are operands, and + is the operator.

Types Of Operators

• Arithmetic Operators
• Increment and Decrement Operators
• Assignment Operators
• Logical Operators
• Type Test Operators

Arithmetic Operators

Arithmetic operators are the most common types of operators. They perform operations like addition, subtraction, multiplication, division, etc.

Operator Symbol	Operation Name	Description
+	Addition	For adding two operands
-	Subtraction	For subtracting two operands
-expr	Unary	Minus For reversing the sign of the expression
*	Multiplication	For multiplying two operands
/	Division	For dividing two operands and give output in double
~/	Division	For dividing two operands and give output in integer
%	Modulus	Remainder After Integer Division
++	Increment	Increase Value By 1. For E.g a++;
--	Decrement	Decrease Value By 1. For E.g a–;

Let’s look at how to perform arithmetic calculations in dart.

Increment and Decrement Operators

With increment and decrement operators, you can increase and decrease values. If ++ is used at the beginning, then it is a prefix. If it is used at last, then it is postfix.

Operator Symbol	Operation Name	Description
++var	Pre Increment	Increase Value By 1. var = var + 1 Expression value is var+1
--var	Pre Decrement	Decrease Value By 1. var = var - 1 Expression value is var-1
var++	Post Increment	Increase Value By 1. var = var + 1 Expression value is var
var--	Post Decrement	Decrease Value By 1. var = var - 1 Expression value is var

Note

++var increases the value of operands, whereas var++ return the actual value of operands before the increment.

Assignment Operators

It is used to assign some values to variables. Here, we are assigning 24 to the age variable.

int age = 24;

Operator Type	Description
=	Assign a value to a variable
+=	Adds a value to a variable
-=	Reduces a value to a variable
*=	Multiply value to a variable
/=	Divided value by a variable

Note

To assign only if the assign-to variable is null use ?? operator.

Relational Operators

Relational operators are also called comparison operators. They are used to make a comparison.

Operator Symbol	Operation Name	Description
>	Greater than	Used to check which operand is bigger and gives result as boolean
<	Less than	Used to check which operand is smaller and gives result as boolean
>=	Greater than or equal to	Used to check which operand is bigger or equal and gives result as boolean
<=	Less than or equal to	Used to check which operand is smaller or equal and gives result as boolean
==	Equal to	Used to check operands are equal to each other and gives result as boolean
!=	Not equal to	Used to check operand are not equal to each other and gives result as boolean

Logical Operators

It is used to compare values.

Operator Type	Description
&&	This is ‘and’, return true if all conditions are true
2 equal	This is ‘or’. Return true if one of the conditions is true
!	This is ’not’. return false if the result is true and vice versa

Type Test Operators

In dart, type test operators are useful for checking types at runtime.

Operator Symbol	Operation Name	Description
is	is	Gives boolean value true if the object has a specific type
is!	is not	Gives boolean value false if the object has a specific type