thereisnodot.utils.collections — thereisnodot/utils 0.1.0

A set of useful collection manipulation functions

filter-map-key clj

(filter-map-key filter-fn some-map)

Will filter on key of a hashmap

filter-map-val clj

(filter-map-val filter-fn some-map)

WIll filter on value of a hashmap

hashmaps->sparse-table clj

(hashmaps->sparse-table datum)

(hashmaps->sparse-table datum null-type)

(hashmaps->sparse-table datum null-type order-by)

Will turn a list of hashmaps into a sparse table. Useful when exporting data into a spreadsheet. First row is a headers row

invert-map clj

(invert-map dataset)

Turn values into keys and reverse. Basically, an inverted index. See tests for example

jaccard clj

(jaccard a b)

Will calculate Jaccard distance over two sets

jaccard-words clj

(jaccard-words some-str some-another-str)

Calculate Jaccard distance between two strings split by space

map-longest clj

(map-longest fn & colls)

Opposite of map. On multiple collections will iterate until the longest sequence has no more members. Will hang when used with lazy collections

map-val clj

(map-val f m)

Will execute function over value of the map

meta-iterate clj

(meta-iterate data-set)

Provide metadata in the form {:index :last? :first?} on a collection

nested-group-by clj

(nested-group-by fs coll & [final-fn])

From: https://stackoverflow.com/a/38842018/3362518 Like group-by but instead of a single function, this is given a list or vec of functions to apply recursively via group-by. An optional final argument (defaults to identity) may be given to run on the vector result of the final group-by. !!careful, deep nesting is not supported

order-by-collection clj

(order-by-collection input order-coll)

Will order input hashmap by order collection. Will append non appearing at the end

pad-coll clj

(pad-coll n coll pad-with)

Pad collection <coll> with <pad-with> until <n> is reached

pad-numbers clj

(pad-numbers n c pad-symbol)

Pad numbers - takes a number and the length to pad to as arguments