---
title: leftExpression
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/nscomparisonpredicate/leftexpression
---

# leftExpression

The left expression for the receiver.

## Declaration

```swift
var leftExpression: NSExpression { get }
```

## Discussion

Discussion nil if there is none.

## See Also

### Getting Information About a Comparison Predicate

- [comparisonPredicateModifier](foundation/nscomparisonpredicate/comparisonpredicatemodifier.md)
- [NSComparisonPredicate.Modifier](foundation/nscomparisonpredicate/modifier.md)
- [customSelector](foundation/nscomparisonpredicate/customselector.md)
- [rightExpression](foundation/nscomparisonpredicate/rightexpression.md)
- [options](foundation/nscomparisonpredicate/options-swift.property.md)
- [NSComparisonPredicate.Options](foundation/nscomparisonpredicate/options-swift.struct.md)
- [predicateOperatorType](foundation/nscomparisonpredicate/predicateoperatortype.md)
- [NSComparisonPredicate.Operator](foundation/nscomparisonpredicate/operator.md)