Clojure sort-by

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WebJan 4, 2014 · Write a function which takes a list or array, and returns a list of the distinct elements, sorted in descending order by frequency. Example: Given: ["John","Doe","Dick","Harry","Harry","Doe","Doe","Harry","Doe","John"] Expected return value: ["Doe","Harry","John","Dick"] code-golf Share Improve this question edited Jan 4, … WebMar 9, 2024 · To avoid this, sort a copy of the array. clojure.core/sort-by ( [keyfn coll] [keyfn comp coll]) Returns a sorted sequence of the items in coll, where the sort order is determined by comparing (keyfn item). If no comparator is supplied, uses compare. comparator must implement java.util.Comparator. Guaranteed to be stable: equal …

Sort the distinct elements of a list in descending order by …

WebSep 21, 2015 · It's simple enough to do with sort-by, but since that sorts in ascending order, you'll have to use reverse to get it to go the right way. (reverse (sort-by (comp :rank second) {:1 {:bar "something" :rank 10} :2 {:bar "other" :rank 20}})) Share Improve this answer Follow edited Sep 21, 2015 at 14:31 answered Sep 21, 2015 at 14:21 Makoto http://duoduokou.com/algorithm/50847994505286230141.html is there ncaa basketball on today

Sorting by two fields in Clojure (Example) - Coderwall

WebOct 5, 2009 · Clojure Docs refers to that use case of sorted-map-by and proposes such solution: (into (sorted-map-by (fn [key1 key2] (compare [ (key1 my-map2) key1] [ (key2 … WebReturns a new sorted set with supplied keys. Any equal keys are handled as if by repeated uses of conj. WebClojure 1.11 Cheat Sheet (v54) Download PDF version / Source repo Many thanks to Steve Tayon for creating it and Andy Fingerhut for ongoing maintenance. Documentation clojure.repl/ doc find-doc apropos dir source pst javadoc (foo.bar/ is namespace for later syms) Primitives Numbers Strings Other Collections Collections is there nc sales tax on labor

datomic - How to sort result in a Datalog query - Stack Overflow

How to find numbers that occur more than once in a list using clojure

WebUsage: (update-keys m f) m f => { (f k) v ...} Given a map m and a function f of 1-argument, returns a new map whose keys are the result of applying f to the keys of m, mapped to the corresponding values of m. f must return a unique key for each key of m, else the behavior is undefined. Added in Clojure version 1.11. WebMar 23, 2015 · 2 Answers Sorted by: 2 Firstly it always helps if the data structure you are trying to sort is valid Clojure. Secondly you need to specify the full path to the value you … is there nclex testing center in uaehttp://duoduokou.com/python/16319062952416940775.html ikea latex mattresses reviews

"WebApr 30, 2024 · Clojure's sort-by function is guaranteed stable. That means you can do something like: (->> coll (sort-by :first-name) (sort-by :last-name) (sort-by :age >)) And that means coll will be sorted by age descending, then last-name and finally first-name.If you're not familiar with stable sorting, that may seem confusing and unintuitive, but it totally … " - Clojure sort-by

Clojure sort-by

Sorting a vector of maps by a value in map against a vector of those ...

WebJan 1, 2010 · 4 Answers. Meikel Brandmeyer just posted a solution to this on the Clojure group. (defn sorted-vec [coll] (let [arr (into-array coll)] (java.util.Arrays/sort arr) (vec arr))) Clojure's sort returns a seq across a sorted array; this approach does much the same thing, but returns a vector, not a seq. If you wish, you can even skip the conversion ... WebFeb 20, 2024 · Below is the C++ program to demonstrate the sorting of vectors of pairs. C++ Java Python3 C# Javascript #include using namespace std; bool sortbyCond (const pair& a, const pair& b) { if (a.first != b.first) return (a.first < b.first); else return (a.second > b.second); } int main () {

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WebClojure synonyms, Clojure pronunciation, Clojure translation, English dictionary definition of Clojure. n. One of the first high-level programming languages, designed to handle … WebMay 3, 2024 · Sorting texts by similarity in Clojure Ask Question Asked 4 years, 10 months ago Modified 4 years, 10 months ago Viewed 187 times 2 This is my first attempt with a lisp language. I'd like your review to address the following points, already listed in order of relevance: Is my code making good use of standard library?

WebApr 14, 2015 · Apr 28, 2015 at 6:38 1 A datalog query finds the set of all of the variables (or tuples of variables) that satisfy the set of clauses. Sort doesn't really have any place inside query - it should be done on the result of the query from outside the query. WebAug 29, 2012 · The Joy of Clojure, Chapter 6.4 describes a lazy quicksort algorithm.The beauty of lazy sorting is that it will only do as much work as necessary to find the first x values. So if x << n this algorithm is O (n). (ns joy.q) (defn sort-parts "Lazy, tail-recursive, incremental quicksort.

WebJan 24, 2024 · More bespoke sorting tends to happen in the consuming code, not at the source, and this is where we'll look at what Clojure offers us. Sorting data with Clojure Clojure is great at taming data of all kinds, here I just want to explore a few ways to get some order to your data using simple functions. Webamazon-web-services /; Amazon web services java.lang.NoClassDefFoundError:aws lambda中的clojure/lang/IFn; Amazon web services java.lang.NoClassDefFoundError:aws lambda中的clojure/lang/IFn

WebFeb 1, 2024 · 1 We have sort-by in clojure to sort values against a vector or map. For example, if I have a vector that I want to sort against: (def ^:const sort-numbers ["one" "two" "three" "four" "five"]) And I have this random vector with disordered values, something like: (def numbers ["two" "three" "one" "four"]) Now, they could be sorted by:

WebMay 3, 2024 · 1 Answer. Sorted by: 4. First, the most serious problem with your code: Never, ever, ever use def inside of defn, unless you really know what you're doing. def creates global variables that last even once the function has returned: (defn func [] (def x 1)) (func) (println x) ; Prints 1! Ouch! ikea latest offersWebMar 1, 2024 · Say I have an array of integers xs taking values from 0 to max, and I need to sort it in O(n) time, so I can't just do (sort xs).. Is there a way to do it with the frequencies function?. In another language I would then do a for to iterate over integers from 0 to max, and for each value x in that range, look up (frequencies x) and then do repeat … ikea latex foam twin mattressWebClojure's sort-by function is guaranteed stable. That means you can do something like: (->> coll (sort-by :first-name) (sort-by :last-name) (sort-by :age >)) And that means coll will be sorted by age descending, then last-name and finally first-name.If you're not familiar with stable sorting, that may seem confusing and unintuitive, but it totally works. ikea latex mattress talalay