| # or method | |
| T or | |
| (T fallback) | |
| <p>If the value is <a href="../../package-fidl_fidl/Some-class.md">Some</a>, the value is returned. If <a href="../../package-fidl_fidl/None-class.md">None</a>, <code>null</code> is | |
| returned. Otherwise, the value <code>isUndefined</code>, in which case the given | |
| <code>fallback</code> value is returned instead.</p> | |
| ## Implementation | |
| ```dart | |
| T? or(T? fallback) { | |
| if (isDefined) { | |
| return _value; | |
| } else { | |
| return fallback; | |
| } | |
| } | |
| ``` | |