> ## Documentation Index
> Fetch the complete documentation index at: https://docs.syntblaze.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Dart Bitwise AND Assignment
The `&=` operator is a compound assignment operator in Dart that performs a bitwise or logical AND operation (`&`) between the left and right operands, then reassigns the resulting value to the left operand.
```dart theme={"dark"}
variable &= expression;
```
This operation is syntactically and logically equivalent to:
```dart theme={"dark"}
variable = variable & expression;
```
## Type Support and Reassignment
In Dart, the `&` operator is defined on the `int`, `BigInt`, and `bool` classes. Because instances of these classes are immutable, the `&=` operator does not modify the existing object in memory. Instead, it evaluates the `&` operation to produce a new value and reassigns that value to the left-hand variable. Consequently, the left operand must be a mutable variable (i.e., not declared as `const` or `final`).
## Integer and BigInt Operations
When applied to `int` or `BigInt` types, `&=` functions as a bitwise AND assignment operator. It compares the binary representations of both operands bit by bit. A resulting bit is set to `1` if and only if the corresponding bits in both operands are `1`; otherwise, it is set to `0`.
```dart theme={"dark"}
int a = 12; // Binary representation: 1100
int b = 10; // Binary representation: 1010
a &= b; // Performs: 1100 & 1010
// Result: 1000
print(a); // Output: 8
```
## Boolean Operations
When applied to `bool` types, `&=` functions as a non-short-circuiting logical AND assignment operator. Unlike the standard short-circuiting logical AND (`&&`), the `&` operator strictly evaluates both the left and right operands. It assigns `true` to the left variable if and only if both operands evaluate to `true`.
```dart theme={"dark"}
bool x = true;
bool y = false;
x &= y; // Performs: true & false
// Result: false
print(x); // Output: false
```
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