#### Note: information on this page refers to Ceylon 1.0, not to the current release.

#
`&`

(intersection) operator

The left-associative, binary infix `&`

operator is used to compute the
*intersection* of its operands.

## Usage

Intersection on values:

```
void m(Set<Integer> primes, Set<Integer> evens) {
Set<Integer> two = primes & evens;
}
```

## Description

**Note**: The `&`

operator is also commonly used to
intersect types.
This page is about using the `&`

operator on *values*.

### Definition

The `&`

operator is defined as follows:

```
lhs.intersection(rhs)
```

See the language specification for more details.

### Polymorphism

The `&`

operator is polymorphic.
The meaning of `&`

depends on the
`Set`

interface

### Type

The result type of the `|`

operator is a `Set`

whose element type is the intersection of the
element types of its operands.

## See also

- API documentation for
`Set`

- set operators in the language specification
- operator precedence in the language specification
- Operator polymorphism