# d10: Digits 0-9

Data types representing the digits zero through nine.

### Modules

Each of the following modules defines a different type named
`D10`

, all of which are different representations of the same
concept:

Data.D10.Char - Defines a

`D10`

type as a newtype for`Char`

, where the values are restricted to characters between

and`0`

.`9`

Data.D10.Num - Defines a

`D10`

type as a newtype for any type with an instance of the`Num`

class, where the values are restricted to numbers between`fromInteger 0`

and`fromInteger 9`

.Data.D10.Safe - Defines a

`D10`

type as`D0 | D1 | D2 | ... | D9`

.

Other modules:

Data.D10.Predicate - Functions to test whether values of various types represent digits in the range

*0*to*9*.

### Quasi-quoters

Each module that defines a `D10`

type also defines quasi-quoters
for it. With the `QuasiQuotes`

GHC extension enabled, a single
digit like *7* can be written as `[d10|7|]`

, and a list of digits
like *[4,5,6]* can be written as `[d10|456|]`

. For Data.D10.Char
and Data.D10.Num, the quasi-quoters are an important feature,
because the `D10`

types defined in these modules have unsafe
constructors, and the quasi-quoters provide compile-time assurance
that we never construct a `D10`

that represents a value outside
the range *0* to *9*. For Data.D10.Safe, the quasi-quoter is
offered merely as a possible convenience, allowing you to write
`[d10|456789|]`

in place of the somewhat longer expression
`[D4,D5,D6,D7,D8,D9]`

.

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Versions [faq] | 0.1.0.0, 0.1.0.1, 0.1.1.0, 0.2.0.1, 0.2.1.0 |
---|---|

Change log | CHANGELOG.md |

Dependencies | base (>=4.10 && <4.13), template-haskell (>=2.12 && <2.15) [details] |

License | MIT |

Copyright | 2018 Typeclass Consulting, LLC |

Author | Chris Martin |

Maintainer | Chris Martin, Julie Moronuki |

Category | Data |

Home page | https://github.com/typeclasses/d10 |

Bug tracker | https://github.com/typeclasses/d10/issues |

Source repo | head: git clone https://github.com/typeclasses/d10 |

Uploaded | by chris_martin at Sun Oct 28 04:32:55 UTC 2018 |

Distributions | NixOS:0.2.1.0 |

Downloads | 367 total (81 in the last 30 days) |

Rating | 2.0 (votes: 1) [estimated by rule of succession] |

Your Rating | |

Status | Docs available [build log] Last success reported on 2018-10-28 [all 1 reports] |

## Downloads

- d10-0.2.1.0.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)