---
title: "-=(_:_:)"
framework: spatial
role: symbol
role_heading: Operator
path: "spatial/angle2dfloat/-=(_:_:)"
---

# -=(_:_:)

Subtracts the second angle from the first and stores the difference in the left-hand-side variable.

## Declaration

```swift
static func -= (lhs: inout Angle2DFloat, rhs: Angle2DFloat)
```