| Registry - useDirectDebugger | 
| Regular Expressions | 
| reject() argument - Promises | 
| Releases - Commands | 
| Releases - Dialog Boxes | 
| Releases - Excel | 
| Releases - Office.js File | 
| Releases - Outlook | 
| Releases - PowerPoint | 
| Releases - Word | 
| Reloading API Objects | 
| Reloading Task Pane | 
| Remainder % | 
| removeAttachmentAsync | 
| removeHandlerAsync - Binding. | 
| removeHandlerAsync - CustomXmlPart. | 
| removeHandlerAsync - Document. | 
| removeHandlerAsync - Settings. | 
| Removing Office Add-in | 
| Render Props - React | 
| REPL (Read Eval Print Loop) | 
| ReplyFormData | 
| Reported Issues | 
| Reported Issues - GitHub | 
| Reporting Bugs - github.com | 
| Request Based Async | 
| RequestContext | 
| RequestContext - context. | 
| RequestContext - ctx. | 
| requestCreateControls - Office.ribbon. | 
| requestUpdate - Office.ribbon. | 
| require('create-react-class') | 
| require('prop-types') | 
| require('react') | 
| Require.js | 
| requiredAttendees.addAsync | 
| requiredAttendees.setAsync | 
| Requirement Sets | 
| Requirement Sets - ActiveView | 
| Requirement Sets - AddinCommands | 
| Requirement Sets - BindingEvents | 
| Requirement Sets - CompressedFile | 
| Requirement Sets - CustomFunctionRuntime | 
| Requirement Sets - CustomXmlParts | 
| Requirement Sets - DialogAPI | 
| Requirement Sets - DocumentEvents | 
| Requirement Sets - ExcelAPI | 
| Requirement Sets - File | 
| Requirement Sets - HTMLCoercion | 
| Requirement Sets - IdentityAPI | 
| Requirement Sets - ImageCoercion | 
| Requirement Sets - isSetSupported | 
| Requirement Sets - MailBox | 
| Requirement Sets - MatrixBindings | 
| Requirement Sets - MatrixCoercion | 
| Requirement Sets - OneNoteAPI | 
| Requirement Sets - OOXML | 
| Requirement Sets - OOXMLCoercion | 
| Requirement Sets - PartialTableBindings | 
| Requirement Sets - PdfFile | 
| Requirement Sets - Selection | 
| Requirement Sets - Settings | 
| Requirement Sets - TableBindings | 
| Requirement Sets - TableCoercion | 
| Requirement Sets - TextBindings | 
| Requirement Sets - TextCoercion | 
| Requirement Sets - TextFile | 
| Requirement Sets - WordAPI | 
| Requirement Sets - WordApiOnline | 
| Requirements Sets - SharedRuntime | 
| requirements.isSetSupported | 
| RequirementTokenOverride | 
| Resizing Arrays | 
| resolve() argument - Promises | 
| Resources - Images | 
| Resources - LongStrings | 
| Resources - ShortStrings | 
| Resources - Urls | 
| ResponseType - Enumeration | 
| Responsive Grid - Fabric UI | 
| REST APIs - Outlook | 
| REST Endpoints | 
| Rest Operator ( ... ) | 
| Rest Parameter ( ... ) | 
| Rest Parameter vs Spread Operator ( ... ) | 
| Restricted Production - break | 
| Restricted Production - continue | 
| Restricted Production - return | 
| Restricted Production - throw | 
| Restructuring Assignment | 
| RestVersion - Enumeration | 
| result.error.message | 
| return await | 
| return Promise.resolve() | 
| return Statement | 
| Reusable Components - React | 
| Revealing Module Pattern | 
| Revealing Prototype Pattern | 
| reverse - Array Method | 
| Ribbon - Built-in Tabs | 
| Ribbon - Contextual Commands | 
| Ribbon - Contextual Tabs | 
| Ribbon - Custom Tabs | 
| Ribbon - Disable Commands | 
| Ribbon - Enable Commands | 
| Ribbon - Groups | 
| Ribbon - Hide Commands | 
| Ribbon - Keyboard Shortcuts | 
| Ribbon - Shortcut Keys | 
| Ribbon API | 
| Ribbon API - 1.1 | 
| Ribbon Buttons | 
| Ribbon Commands | 
| Ribbon Commands - Built-in Controls | 
| Ribbon Commands - ContextMenu | 
| Ribbon Commands - Contextual | 
| Ribbon Commands - CustomTab | 
| Ribbon Commands - Disablying | 
| Ribbon Commands - Enabling | 
| Ribbon Commands - Hiding | 
| Ribbon Commands - Menu | 
| Ribbon Commands - OfficeControl | 
| Ribbon Commands - OfficeMenu | 
| Ribbon Commands - OfficeTab | 
| Ribbon Commands - Questions | 
| Ribbon Commands - ribbon.requestCreateControls | 
| Ribbon Commands - ribbon.requestUpdate | 
| Ribbon Commands - Shortcut Keys | 
| Ribbon Commands - Showing | 
| Ribbon Commands = Add-in Commands | 
| Ribbon Custom Tabs | 
| Ribbon Customization | 
| RoamingSettings | 
| Round Trip | 
| Routing - React Router | 
| Routing Parameters | 
| Ruby | 
| Ruby on Rails | 
| RuleCollection | 
| Rules - Activation | 
| Runtime Checks | 
| Runtime Logging - Registry | 
| Runtime Manifest Element | 
|  |