Dart Assignment Operators
Dart assignment operators are used to initialize and assign values to the operands. The basic assignment operator assigns the value on the right-hand side(RHS) to the variable on the left-hand side(LHS).
The simple assignment operators are as follows:
| Operator Symbol | Description |
| = | Simple Assignment
The assignment operator is used to assign values to the expression or the variable. |
| ??= | Null-aware assignment.
This assignment operator assigns the value on the right-hand side to the variable on the left-hand side if the variable is null. Otherwise, the variable’s value remains unchanged. |
Example
Let’s look at some example Dart code to understand the operators.
/*
* Assignment Operators demo Dart Program
* Dart Tutorials - www.TestingDocs.com
*/
void main() {
int x=9;
int y=7;
//Assign a value to the variable result
int result= x - y;
print(result);
// Assign a value to a variable when LHS is null
var sum;
sum ??= x+y;
// the sum of x and y is assigned
print(sum);
//Let's try to reassign some value to the variable sum
sum ??= x * y; // value is not assigned
print(sum);
}
Compound assignment operators:
Dart also supports compound assignment operators that do some operation on the operands before the assignment.
| Operator Symbol | Name | Description |
| += | Addition assignment | Adds the value on the right-hand side to the variable on the left-hand side and assigns the result to the variable. |
| -= | Subtraction assignment | Subtracts the value on the right-hand side from the variable on the left-hand side and assigns the result to the variable. |
| *= | Multiplication assignment | Multiplies the variable on the left-hand side by the value on the right-hand side and assigns the result to the variable. |
| /= | Division assignment | Divides the variable on the left-hand side by the value on the right-hand side and assigns the result to the variable. |
| %= | Modulus assignment | Divides the variable on the left-hand side by the value on the right-hand side and assigns the remainder to the variable. |
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More information on Dart programming language: