| read eval print loop | On slide | In textbook |
| readability - due to us of types | On slide | In textbook |
| recursion | On slide | In textbook |
| Recursion | On slide | In textbook |
| Recursion versus iteration | On slide | In textbook |
| reduce-left | On slide | In textbook |
| reduce-right | On slide | In textbook |
| Reduction | On slide | In textbook |
| redundancy | On slide | In textbook |
| Referential transparency | On slide | In textbook |
| REPL | On slide | In textbook |
| Representing HTML with objects in Scheme | On slide | In textbook |
| rest parameters | On slide | In textbook |
| reverse | On slide | In textbook |
| Rewrite rules | On slide | In textbook |
| run time type check | On slide | In textbook |