| Label - ExtensionPoint |
| Lambda Function = Arrow Function |
| lastIndexOf - Array Method |
| LaunchEvent - OnNewAppointmentOrganizer |
| LaunchEvent - OnNewMessageCompose |
| LaunchEvents - Manifest |
| length Property |
| LESS - Styling |
| let - Block Scope |
| let - ES 2015 |
| let - TypeScript |
| let Blocks |
| let Keyword |
| let Statements |
| Lexical Scope |
| Lexical Scope - eval |
| Lexical Scope - with |
| license.value |
| Lifecycle Events - React |
| Line Breaks |
| Line Continuation |
| Line Continuation Character |
| Line Terminator |
| Linting |
| Linting - ESLint |
| Linting - JSHint |
| Linting - JSLint |
| List Of Objects |
| Lists |
| Literals - Array |
| Literals - Function |
| Literals - Initialisation |
| Literals - Object |
| Live Reloading |
| Load Calls |
| Load Time |
| loadCustomPropertiesAsync |
| Loading API Objects |
| Loading Properties |
| Local Catalogs |
| Local Document Storage |
| Local Scope |
| Local Storage |
| LocaleTokenOverride |
| Localisation - Fabric UI |
| Localization |
| localStorage Object |
| Log File |
| Logging Bugs - github.com |
| Logical Operators |
| Long Running Runtime |
| LongStrings - Resources |
| Loops - Array.filter |
| Loops - Array.foreach |
| Loops - Array.map |
| Loops - Array.reduce |
| Loops - do/while |
| Loops - for |
| Loops - for/each |
| Loops - for/in |
| Loops - for/of |
| Loops - while |
| Loose Typing |
| Loosely Typed |