f8.1/sdk/dart/package-fuchsia_inspect_inspect/DoubleProperty/subtract.md

# subtract method




    *[<Null safety>](https://dart.dev/null-safety)*




void subtract
(double delta)

_<span class="feature">inherited</span>_



<p>Subtracts <code>delta</code> from the value of this metric.</p>



## Implementation

```dart
void subtract(T delta) {
  _writer?.subMetric(index, delta);
}
```