Index - D
| Day | Preliminaries |
| decodeBase16C | Preliminaries |
| decodeBase64C | Preliminaries |
| decodeBase64URLC | Preliminaries |
| decodeFloat | Preliminaries |
| decodeUtf8 | Preliminaries |
| decodeUtf8C | Preliminaries |
| decodeUtf8LenientC | Preliminaries |
| deepseq | Preliminaries |
| defaultCons | Preliminaries |
| defaultFind | Preliminaries |
| defaultIntersperse | Preliminaries |
| defaultReverse | Preliminaries |
| defaultSnoc | Preliminaries |
| defaultSortBy | Preliminaries |
| defaultSplitWhen | Preliminaries |
| defaultTimeLocale | Preliminaries |
| DefName | Preliminaries |
| delete | Preliminaries |
| deleteBy | Preliminaries |
| deleteMap | Preliminaries |
| deleteSet | Preliminaries |
| Deque | Preliminaries |
| difference | Preliminaries |
| differenceMap | Preliminaries |
| displayException | Preliminaries |
| distribute | Preliminaries |
| div | Preliminaries |
| divMod | Preliminaries |
| DList | Preliminaries |
| DLList | Preliminaries |
| doesNotExistErrorType | Preliminaries |
| Double | Preliminaries |
| Down | |
| 1 (Data Constructor) | Preliminaries |
| 2 (Type/Class) | Preliminaries |
| drainTo | Preliminaries |
| drop | Preliminaries |
| dropC | Preliminaries |
| dropCE | Preliminaries |
| dropWhile | Preliminaries |
| dropWhileC | Preliminaries |
| dropWhileCE | Preliminaries |
| dupChan | Preliminaries |
| dupTChan | Preliminaries |