Dart provides some relatively simple operators to simplify the operation, most of them are the same as Java, the following introduces a few different operators
- Arithmetic operator
- Relational operator
- Logical Operators
- Assignment operator
- Conditional expression
Arithmetic operator
| Sr.No |
Operators & Meaning |
| 1 |
+
Add
|
| 2 |
−
Subtract
|
| 3 |
-expr
Unary minus, also known as negation (reverse the sign of the expression)
|
| 4 |
*
Multiply
|
| 5 |
/
Divide
|
| 6 |
~/
Divide, returning an integer result
|
| 7 |
%
Get the remainder of an integer division (modulo)
|
| 8 |
++
Increment
|
| 9 |
--
Decrement
|
Arithmetic Operators Example
|
int a = 2;
int b = 10;
print(a + b); //12
print(a - b);//-8
print(a * b);//20
print(a / b);//0.2
print(a ~/ b);//0
print(a % b);//2
print(a++);// 2
print(++a); //3
print(a--);//4
print(--a);//2
|
Relational operator
Relational Operators tests or defines the kind of relationship between two entities. Relational operators return a Boolean value i.e. true/ false
| Operator |
Description |
Example |
| > |
Greater than |
(A > B) is False |
| < |
Lesser than |
(A < B) is True |
| >= |
Greater than or equal to |
(A >= B) is False |
| <= |
Lesser than or equal to |
(A <= B) is True |
| == |
Equality |
(A==B) is False |
| != |
Not equal |
(A!=B) is True |
Relational operator Example
|
int a = 2;
int b = 10;
print(a == b);//false
print(a != b);//true
print(a > b);//false
print(a < b);//true
print(a >= b);//false
print(a <= b);//true
|
logic operation
Boolean operations
Logical operators are used to combine two or more conditions. Logical operators return a Boolean value
| Operator |
Description |
Example |
| && |
And − The operator returns true only if all the expressions specified return true
|
(A > 10 && B > 10) is False. |
| || |
OR − The operator returns true if at least one of the expressions specified return true
|
(A > 10 || B > 10) is True. |
| ! |
NOT − The operator returns the inverse of the expression’s result. For E.g.: !(7>5) returns false
|
!(A > 10) is True. |
Example
|
bool isTrue = true;
bool isFalse = false;
print(!isTrue);//false
print(isTrue && isFalse);//false
print(isTrue || isFalse);
|
Assignment operators
The following table lists the assignment operators available in Dart.
| Sr.No |
Operator & Description |
| 1 |
=(Simple Assignment )
Assigns values from the right side operand to the left side operand
Ex:C = A + B will assign the value of A + B into C
|
| 2 |
??=
Assign the value only if the variable is null
|
| 3 |
+=(Add and Assignment)
It adds the right operand to the left operand and assigns the result to the left operand.
Ex: C += A is equivalent to C = C + A
|
| 4 |
?=(Subtract and Assignment)
It subtracts the right operand from the left operand and assigns the result to the left operand.
Ex: C -= A is equivalent to C = C – A
|
| 5 |
*=(Multiply and Assignment)
It multiplies the right operand with the left operand and assigns the result to the left operand.
Ex: C *= A is equivalent to C = C * A
|
| 6 |
/=(Divide and Assignment)
It divides the left operand with the right operand and assigns the result to the left operand.
|
Example
|
int m = 10;
int n = 5;
n ??= 10;
print(n);
m += 2;
print(m);//12
m -= 2;
print(m);//10
|
Conditional Expressions
1. Trinocular operator: condition? Expr1: expe2
If condition is true, the expression evaluates expr1 (and returns its value); otherwise, it evaluates and returns the value of expr2.
2. ?? Operator: expr1 ?? expr2
If expr1 is non-null, return its value; otherwise, calculate and return the value of expr2
Example
|
int age =10;
String str = age == 10 ? "10" :"20";
print(str);
String x ;
String y = "java";
String z = x ?? y;
print(z);
|
