| RadioButton - Fabric UI |
| Rails |
| Rails - Ruby |
| React |
| React - Events |
| React - JSX |
| React - Rendering Elements |
| React Component Class |
| React Component Type |
| React Developer Tools |
| React DevTools |
| React Element |
| React Extensions for .NET (Rx) |
| React with Redux |
| React with Relay |
| React.Component |
| React.Component<P, S> |
| React.createClass |
| React.createElement |
| React.js |
| ReactDOM |
| ReactDOM.render |
| ReadWriteDocument |
| ReadWriteItem |
| Reason Parameter |
| RecipientType - Enumeration |
| Recursive Functions |
| Reduce Method - Arrays |
| Redux - State Management |
| Redux - Workflow |
| Reference Directives - /// |
| Reference Types - Array |
| Reference Types - Object |
| References - /// |
| references.js |
| Regex |
| Regular Expressions |
| Releases - Commands |
| Releases - Dialogs |
| Releases - Excel |
| Releases - Office JS |
| Releases - Outlook |
| Releases - PowerPoint |
| Releases - Word |
| Reloading API Objects |
| Reloading Task Pane |
| removeHandlerAsync - Binding. |
| removeHandlerAsync - CustomXmlPart. |
| removeHandlerAsync - Document. |
| removeHandlerAsync - Settings. |
| Request Based Async |
| RequestContext |
| RequestContext - context. |
| RequestContext - ctx. |