---
title: NSExpression.ExpressionType.variable
framework: foundation
role: symbol
role_heading: Case
path: foundation/nsexpression/expressiontype-swift.enum/variable
---

# NSExpression.ExpressionType.variable

An expression that always returns whatever value is associated with the key specified by ‘variable’ in the bindings dictionary.

## Declaration

```swift
case variable
```

## See Also

### Constants

- [NSExpression.ExpressionType.constantValue](foundation/nsexpression/expressiontype-swift.enum/constantvalue.md)
- [NSExpression.ExpressionType.evaluatedObject](foundation/nsexpression/expressiontype-swift.enum/evaluatedobject.md)
- [NSExpression.ExpressionType.keyPath](foundation/nsexpression/expressiontype-swift.enum/keypath.md)
- [NSExpression.ExpressionType.function](foundation/nsexpression/expressiontype-swift.enum/function.md)
- [NSExpression.ExpressionType.unionSet](foundation/nsexpression/expressiontype-swift.enum/unionset.md)
- [NSExpression.ExpressionType.intersectSet](foundation/nsexpression/expressiontype-swift.enum/intersectset.md)
- [NSExpression.ExpressionType.minusSet](foundation/nsexpression/expressiontype-swift.enum/minusset.md)
- [NSExpression.ExpressionType.subquery](foundation/nsexpression/expressiontype-swift.enum/subquery.md)
- [NSExpression.ExpressionType.aggregate](foundation/nsexpression/expressiontype-swift.enum/aggregate.md)
- [NSExpression.ExpressionType.anyKey](foundation/nsexpression/expressiontype-swift.enum/anykey.md)
- [NSExpression.ExpressionType.block](foundation/nsexpression/expressiontype-swift.enum/block.md)
- [NSExpression.ExpressionType.conditional](foundation/nsexpression/expressiontype-swift.enum/conditional.md)