f8/sdk/dart/package-fuchsia_inspect_inspect/Node/doubleProperty.md

# doubleProperty method




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




[DoubleProperty](../../package-fuchsia_inspect_inspect/DoubleProperty-class.md)? doubleProperty
(String name)





<p>Returns a <a href="../../package-fuchsia_inspect_inspect/DoubleProperty-class.md">DoubleProperty</a> with <code>name</code> on this node.</p>
<p>If a <a href="../../package-fuchsia_inspect_inspect/DoubleProperty-class.md">DoubleProperty</a> with <code>name</code> already exists and is not
deleted, this method returns it.</p>
<p>Otherwise, it creates a new property initialized to 0.0.</p>
<p>Throws <a href="../../package-fuchsia_inspect_inspect/InspectStateError-class.md">InspectStateError</a> if a non-deleted property with <code>name</code>
already exists but it is not a <a href="../../package-fuchsia_inspect_inspect/DoubleProperty-class.md">DoubleProperty</a>.</p>



## Implementation

```dart
DoubleProperty? doubleProperty(String name) {
  if (_writer == null) {
    return DoubleProperty.deleted();
  }
  if (_properties.containsKey(name)) {
    if (_properties[name] is! DoubleProperty) {
      throw InspectStateError("Can't create DoubleProperty named $name;"
          ' a different type exists.');
    }
    return _properties[name] as DoubleProperty?;
  }
  return _properties[name] = DoubleProperty._(name, this, _writer!);
}
```