CLOJURE QUESTIONS

GET returning only true params (Clojure)

Does that help Assuming @profiles is a map where values are profiles, then you can return only profiles where :public-profile is true with filter. For example:

TAG : clojure

Date : January 11 2021, 03:34 PM , By : kbrust

How to split a vector of CLI arguments into pairs in Clojure?

I think the issue was by ths following , To split them into pairs, use partition:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : foxthrot

How to setup figwheel-main to reload code served by clojure backend

Hope this helps Please keep in mind that you have two programs running now, one in CLJS in the browser and another one in CLJ on the backend. They communicate over the network which adds in more complexity.If you are already using Reagent in your CLJ

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Puneet Madaan

Clojure: delete item from a ref?

will be helpful for those in need As there error says, you're trying to iterate a function. This is coming about because when you write:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : beng

How to merge items in a clojure list by types?

may help you . It is a little bit complicated, but since you asked for flexibility, there you go:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : gcomstock

How to mental model this clojure fibonacci generator?

I wish this helpful for you Macroexpanding (lazy-cat [0 1] (map + (rest fib-seq) fib-seq) leads to:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : s8k

How to print elements in a vector of vectors

like below fixes the issue You can use cl-format to handle list (and list of list in this case) with a control string:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : mdiezb

Is is possible to read from an input file and convert each line of the text file into a vector of strings?

it should still fix some issue Go step by step.Read data (As file is small, just slurp). Let's name the file grid.txt

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Kenny

Hot to fix "WARNING: any? already refers to: #'clojure.core/any? in namespace: leiningen.midje, being replaced by:

hope this fix your issue This particular issue was solved in this Pull Request.For the general case you can get rid of this warning (when it comes from your code) by excluding (= un-refering) the symbol you want to require from another namespace than

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Tim Tyrrell

Rank elements in a sequence in clojure

Hope this helps You can use sort-by to order the input sequence and then use map-indexed to convert it into a rank:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Tamizhvendan

Is there a threaded way to perform an "or" (or any test) condition in clojure?

wish help you to fix your issue I'd use some here. It's essentially a sequence friendly or check that can help cut down on duplication when all the conditions are basically the same:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : helloedwin

How to obtain paths to all the child nodes in a tree that only have leaves using clojure zippers?

Hope that helps Hiccup-style structures are a nice place to visit, but I wouldn't want to live there. That is, they're very succinct to write, but a giant pain to manipulate programmatically, because the semantic nesting structure is not reflected in

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Praetoriansentry

Right way to change a value on a map on clojure

Any of those help assoc does not take a function as its last argument; unless you were wanting to associate a function with a key in the map. (assoc mymap :a 5) does what you want.I'll add though, update, which does take a function, could be used her

TAG : clojure

Date : January 02 2021, 06:48 AM , By : user86493

why records are not functions?

To fix this issue Others have answered this, but here's how you make one of your defrecord types implement the IFn interface:

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Gazza

Function look-up in clojure

To fix this issue Help me I need to write look up function that finds value in the list-of-lists in that every element is in order (key value). For example

TAG : clojure

Date : January 02 2021, 06:48 AM , By : user103892

Learning Clojure - What should I know about Java and more

hop of those help? Explore the javadocs only as needed when you can't figure out how to do something using Clojure's core API or the Clojure contrib libraries.For 3rd party libraries, there is Clojars. I'm not sure how widely it has been adopted by t

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Mforg

Hidden features of Clojure

this will help Clojure has an immutable, persistent queue datatype, PersistentQueue, but it doesn't (yet?) have literal reader syntax or Clojure wrapper functions, so you have to create one via a Java call. Queues conj (push) onto the rear and pop fr

TAG : clojure

Date : January 02 2021, 06:48 AM , By : Ed.

How is the host interop dot macro implemented in clojure

will be helpful for those in need These are described under the Java Interop section of the manual under Member Accress These are special forms that are expanded at macro expansion time.

TAG : clojure

Date : December 31 2020, 03:04 AM , By : Stephen Dewar

Using update-in without a get-in to retrieve the value to modify

Hope that helps your anonymous function should take the thing it wants to modify and use that instead of doing the get-in

TAG : clojure

Date : December 31 2020, 02:07 AM , By : Kilimanjaro

Custom indentation in Clojurescript and Cider for 3rd party macro

wish helps you This can be configured in clojure-mode (a dependency of CIDER), documentation is here.For example, (put-clojure-indent 'async 1).

TAG : clojure

Date : December 30 2020, 04:08 PM , By : Thomas Gueze

Are keywords with the same name guaranteed to be identical?

Does that help Keywords which are = are guaranteed to also be identical?, and those which are not = are of course guaranteed to not be identical?.:a is different from ::a because the latter has a namespace component and the former doesn't. How could

TAG : clojure

Date : December 28 2020, 02:06 PM , By : Tetting

Canonical approach to return based on type of the argument in Clojure

Hope this helps There's essentially 3 dispatch methods in Clojure: Use cond combined with predicates (that's methods that return true or false and often have a name ending in ?) as Alan has described. Use Protocols which dispatch on the type of the f

TAG : clojure

Date : December 27 2020, 03:23 PM , By : Guyou

in clojure, why core.match a map inside a vector?

this will help You can; or at least that's what I'm inferring from reading the source and documentation of match.The source of match starts with the lines:

TAG : clojure

Date : December 25 2020, 04:01 PM , By : user104292

How to bind function variables to current scope of execution in Clojure?

around this issue Given: , there is a way to do it using dynamic bindings:

TAG : clojure

Date : December 25 2020, 02:31 PM , By : Marie Ramos

How does a macro work if it returns a sequence instead of a list?

I hope this helps . You have just proven that a list, a seq, and a sequence are all treated as function call sites by the Clojure compiler. That is your answer.

TAG : clojure

Date : December 25 2020, 12:09 PM , By : Tamizhvendan

Can the ring-anti-forgery middleware be applied conditionally?

it should still fix some issue You can use ring.middleware.conditional's operators to conditionally add middleware. For example, to conditionally add the api-defaults mentioned in the comment of Jochen Bedersdorfer:

TAG : clojure

Date : December 25 2020, 09:19 AM , By : James B

If clojure is compiled to byte-code, why is there java source for clojure?

This might help you Some axioms: Clojure code that one writes in Clojure is compiled to bytecode. Java code that one writes in Java is also compiled to bytecode. Some core parts of Clojure is written in Java.

TAG : clojure

Date : December 25 2020, 06:47 AM , By : Roel van Dijk

performance gain while using core.reducers

will be helpful for those in need I tried the below to compare the performance of core/map vs transducers vc core.reducers/map vs core.reducers/fold -

TAG : clojure

Date : December 25 2020, 01:01 AM , By : user177910

using (time f) always gives higher value the first time

I wish this helpful for you This is normal, especially for any language with JIT compilation.First, the JIT end:

TAG : clojure

Date : December 24 2020, 03:30 PM , By : ezzze

Serve static resources using Clojure's Ring

To fix this issue You need to add one bit of middleware that will take care of serving static files from a folder you can select, something like the following:

TAG : clojure

Date : December 23 2020, 07:06 AM , By : MP.

Clojure loop with count

This might help you First, keep in mind that for is for list comprehension, that is, creating new sequences. For looping through a sequence for some side effect, like printing, you probably want to use doseq.To include a numeric count with each eleme

TAG : clojure

Date : December 23 2020, 07:05 AM , By : fayoh

Clojure spec: Using a "spec" instead of a "pred" in "coll-of" actually works. Is this ok?

I hope this helps you . I'm trying out Clojure spec and calling it from a function :pre constraint. , Is this correct style and expected to work?

TAG : clojure

Date : December 22 2020, 03:01 AM , By : Patastroph

clojure-spec: Unable to get function's postcondition right

help you fix your problem You're just missing the prefix to make your anonymous function in the :post condition. The post condition needs to be a function that can take the output of the subject function's invocation.

TAG : clojure

Date : December 21 2020, 06:01 PM , By : user93312

Clojure "map" function ordering guarantees?

I wish this help you Yes, (map str ["1" "2" "3"] ["a" "b" "c"]) will always return ("1a" "2b" "3c").From the source code here you can see it calls the function on (first s1) (first s2) and then calls (map f (rest s1) (rest s2)), so it always processe

TAG : clojure

Date : December 21 2020, 01:01 PM , By : orneka

How do you mock file reading in Clojure

I think the issue was by ths following , You can mock out a call to function with with-redefs, that "Temporarily redefines Vars while executing the body". E.g.,

TAG : clojure

Date : December 20 2020, 04:42 AM , By : Tom Smith

why the 2 way indirection of symbol -> var -> value

I hope this helps you . You can find a detailed description of the Clojure var mechanism here: When to use a Var instead of a function?Since Clojure data is immutable, you need an indirection mechanism like a var or atom to allow for "change". This i

TAG : clojure

Date : December 17 2020, 07:29 AM , By : Ravenal

lein repl results in java.lang.AssertionError (transport-fn)

Hope this helps I had the same issue, and it seems to be a bug in lein 2.8.2. https://github.com/technomancy/leiningen/issues/2497. You can downgrade with: lein upgrade 2.8.1. Credit to the clojurians slack channel.

TAG : clojure

Date : December 05 2020, 12:18 PM , By : Patastroph

Clojure code to create and store objects

may help you . One way to get the advantages of the Clojure ecosystem on this project would be to represent your story as a map:

TAG : clojure

Date : November 28 2020, 01:01 AM , By : user157064

Case cases in Clojure

seems to work fine Assuming that you really are dealing with compile-time constants, case semantically conveys the nature of your condition better than cond or condp. case is more concise than cond or condp. Example:

TAG : clojure

Date : November 27 2020, 09:01 AM , By : Waheedoo

Clojure - Calculate accumulative sum of vector of maps

Hope that helps To continue your solution (and if you don't mind iterating data twice):

TAG : clojure

Date : November 26 2020, 03:04 PM , By : keird

How to make Clojure tests stop tests running in case one of them failed?

I think the issue was by ths following , I use eftest as a better alternative to default clojure.test runner:How to use?

TAG : clojure

Date : November 26 2020, 06:23 AM , By : Arun Thakkar

Alternatives to repeated use of partial when using clojure's `comp`

wish helps you Since many of the answers here already don't answer the original question, but suggest different approaches, I put that one back up too.I'd go with reduce and destructuring:

TAG : clojure

Date : November 24 2020, 09:00 AM , By : user182548

How do I update a vector element of an atom in Clojure?

hope this fix your issue If the indices of the vector correspond to :ids, you can use something like

TAG : clojure

Date : November 22 2020, 11:05 AM , By : Ram

clojure lazy function - Clojure Koan

I hope this helps . clojure.core/iterate takes two arguments:

TAG : clojure

Date : November 22 2020, 10:58 AM , By : Sid

Clojure Integer Overflow Using reduce function

like below fixes the issue I am currently going through the project euler problems using Clojure. The second question requires you to sum the first 4000000 fibonaci numbers. Unfortunately my code is giving me an Integer Overflow exception. , use +' i

TAG : clojure

Date : November 22 2020, 10:40 AM , By : acolomba

How to accept only ordered collections in spec

I hope this helps . Specs for sequences (regex specs) should not match ordered, that is sequential collections. This was a bug that has been fixed in current versions of spec, see CLJ-2183.In Clojure 1.10.0-RC5 the results are as expected:

TAG : clojure

Date : November 22 2020, 04:01 AM , By : wpoch

Listing files in two separate directories in Clojure

Any of those help You were not returning something from your let form, so notice here p-files is outside the []:

TAG : clojure

Date : November 21 2020, 03:00 PM , By : Stuka

How to iterate a range of numbers in Clojure?

wish help you to fix your issue In Clojure, there's really no universal answer to this as it's decided by why you want to iterate through those numbers.You might want to produce some value for each of the numbers and then collect them in a list, in w

TAG : clojure

Date : November 21 2020, 07:31 AM , By : user96271

Custom map function behaves oddly in lazy scenarios

wish helps you The destructing you do in my-map will call next on your lazy sequence.You can avoid that by not destructing:

TAG : clojure

Date : November 20 2020, 11:01 PM , By : Olexiy P.

idiomatic way of extending clojure reify

Does that help As far as I can tell your goal is to wrap an object created by reify and inject new behavior on calls to that object. One direction would be to write a macro that takes the place of reify and inserts an "around" call for every reified

TAG : clojure

Date : November 19 2020, 12:01 PM , By : Bharath

Adding JSON to an array in mongo database

With these it helps Make sure that your query part of monger.collection/update call contains a correct criteria. You should also inspect the WriteResult returned by Mongo driver to see if they were successful or not.I have tested using $push in REPL

TAG : clojure

Date : November 18 2020, 11:01 PM , By : Tom Smith

Why there is no not-nil? in Clojure?

Hope this helps In clojure I noticed functions with logical opposites like [[if x if-not] [every? x not-every]]. I wonder why [not-nil?] is not included, is it on purpose or because it is too trivial. , There is some? since Clojure 1.6:

TAG : clojure

Date : November 18 2020, 03:49 PM , By : Marc

Clojure ClassCastException long to IFn

it helps some times 1) you need to get rid of the extra parens around a, b, x, and y.2) anytime you see a bunch of first and second, that's a good clue that you should be destructuring your inputs instead:

TAG : clojure

Date : November 17 2020, 08:25 AM , By : Priyatna Harun

How to run clojure on OpenShift

will help you I am trying to deploy a Clojure application on OpenShift using the clojure-cartridge running the following command: , I don't know anything about OpenShift though this error:

TAG : clojure

Date : November 17 2020, 04:28 AM , By : Kubla Khan

Syntax issue in Clojure Koan - anonymous function has extra ()

around this issue 06_function.clj contains this question, I can't figure out why there is an extra pair of () in position 1 and 2, since position 3 already has brackets wrapped up.

TAG : clojure

Date : November 16 2020, 06:27 AM , By : Alpinfish

clojure cannot define same function in different namespace? not possible

fixed the issue. Will look into that further This probably means you have dirty REPL state. Maybe you moved the function parse-line from one namespace to the other. I suggest restarting the REPL, or unload parse-line from map-reduce3: How to unload a

TAG : clojure

Date : November 15 2020, 11:01 PM , By : IanM

Why are Clojure's `let` and `for` both monads?

fixed the issue. Will look into that further In this discussion Brian Marick makes the point that let and for are monads in Clojure: , Why are Clojure's let and for both monads?They aren't.

TAG : clojure

Date : November 14 2020, 05:16 PM , By : Hibame

`def` vs `declare` for forward declaration

wish help you to fix your issue Both declare and def do create an unbound var, but there are 3 advantages to using declare: You can create multiple vars in one statement, e.g. (declare x y z) The vars are tagged with the additional metadata {:declare

TAG : clojure

Date : November 13 2020, 05:43 AM , By : Tom

How to update a reagent atom with a vector of maps in Clojure

fixed the issue. Will look into that further assoc-in works with any nesting of associative structures, including maps inside vectors*. As such, I'd recommend a swap! with assoc-in

TAG : clojure

Date : November 12 2020, 09:01 AM , By : Adam May

Clojure - close over a function in another namespace

this will help Let's say that I have the following : , Rewrite:

TAG : clojure

Date : November 11 2020, 09:01 AM , By : Dennizzz