Index - R
| Ratio | Prolude.Core, Prolude |
| Rational | Prolude.Core, Prolude |
| Read | Prolude.Core, Prolude |
| read | Prolude.Core, Prolude |
| Real | Prolude.Core, Prolude |
| RealFloat | Prolude.Core, Prolude |
| RealFrac | Prolude.Core, Prolude |
| realToFrac | Prolude.Core, Prolude |
| recip | Prolude.Core, Prolude |
| rem | Prolude.Core, Prolude |
| replicate | Prolude.Core, Prolude |
| return | Prolude.Core, Prolude |
| reverse | Prolude.Core, Prolude |
| Right | Prolude.Core, Prolude |
| round | Prolude.Core, Prolude |