# persistent-vector: A persistent sequence based on array mapped tries

Versions | 0.1.0.0, 0.1.0.1, 0.1.0.3, 0.1.1 |
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Dependencies | base (==4.*), deepseq [details] |

License | BSD-3-Clause |

Author | Tristan Ravitch |

Maintainer | travitch@cs.wisc.edu |

Category | Data |

Home page | https://github.com/travitch/persistent-vector |

Bug tracker | https://github.com/travitch/persistent-vector/issues |

Source repo | head: git clone git://github.com/travitch/persistent-vector.git |

Uploaded | by TristanRavitch at Wed Aug 29 04:31:20 UTC 2012 |

Distributions | NixOS:0.1.1 |

Downloads | 1361 total (18 in the last 30 days) |

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

Your Rating | |

Status | Docs uploaded by user Build status unknown [no reports yet] Hackage Matrix CI |

This package provides persistent vectors based on array mapped tries. The implementation is based on the persistent vectors used in clojure, but in a Haskell-style API. The API is modeled after Data.Sequence from the containers library.

Technically, the element-wise operations are O(log(n)), but the underlying tree cannot be more than 7 or 8 levels deep so this is effectively constant time.

One change from the clojure implementation is that this version supports
O(1) slicing, though it does cheat a little. Slices retain references
to elements that cannot be indexed. These extra references (and the space
they occupy) can be reclaimed by `shrink`

ing the slice. This seems like
a reasonable tradeoff, and, I believe, mirrors the behavior of the vector
library.

Highlights:

O(1) append element, indexing, updates, length, and slicing

Reasonably compact representation

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## Downloads

- persistent-vector-0.1.0.1.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)