mpenet

Old but still relevant, and since innoq link-rots.

Jarkko Oranen a.k.a. Chousuke posted an excellent table summarizing the performance characteristics of functions operating on different Clojure data structures:

disj--near-constantlogarithmic----

	hash-map	sorted-map	hash-set	sorted-set	vector	queue	list	lazy seq
conj	near-constant	logarithmic	near-constant	logarithmic	constant (tail)	constant (tail)	constant (head)	constant (head)
assoc	near-constant	logarithmic	-	-	near-constant	-	-	-
dissoc	near-constant	logarithmic	-	-	-	-	-	-

borkdude

#!/usr/bin/env bb

(ns update-deps
  (:require [clojure.edn :as edn]
            [clojure.java.io :as io]
            [clojure.pprint :as pp :refer [pprint]]
            [clojure.walk :as walk]))

(defn- merge-defaults [deps defaults]
  (let [ff (some-fn deps (complement (partial contains? deps)))

hiredman

(defonce ^Logger logger (doto (Logger/getLogger "clojure")
                          (.setUseParentHandlers false)
                          (.addHandler
                           (doto (ConsoleHandler.)
                             (.setLevel Level/ALL)
                             (.setFormatter
                              (proxy [SimpleFormatter] []
                                (format [^LogRecord record]
                                  (let [sb (StringBuilder.)]
                                    (.append sb "#:log{")

eihli

(ns weighted-rand
  (:import clojure.lang.PersistentQueue))

(defprotocol Rand
  (nextr [_ rng]))

;; Vose's alias method
;; http://www.keithschwarz.com/darts-dice-coins/

(deftype Vose [n ^ints alias ^doubles prob]

hiredman

(ns deployer
  (:require [clojure.tools.deps.alpha :as deps]
            [clojure.tools.deps.alpha.reader :as reader]
            [clojure.java.io :as io]
            [clojure.string :as string])
  (:import (java.security MessageDigest)
           (com.jcraft.jsch JSch)
           (java.net URI)))

(def hex-alphabet (vec "0123456789ABCDEF"))

reborg

Conference Radar

My list of interesting conf, mainly Europe/Lispy (but not only).

• https://inclojure.org (Jan, Bengalaru, India)
• https://fby.by (Jan, Minsk, Belarus)
• http://www.lambdadays.org/ (Feb, Krakow, Poland)
• https://10times.com/clojured ClojureD (Feb, Berlin)
• https://racketfest.com (Mar, Berlin)
• https://clojuredays.org Dutch Clojure Days (Apr)

mpneuried

UPDATE public.mytable SET
jsonfieldname = jsonb_set( jsonfieldname, '{json_obj_key}', array_to_json(
	ARRAY(
		SELECT DISTINCT( UNNEST( ARRAY(
			SELECT json_array_elements_text( COALESCE( jsonfieldname::json->'json_obj_key', '[]' ) )
		) || ARRAY['Element to add'] ) )
	)
)::jsonb )
WHERE id = 23
RETURNING *;

frenchy64

update_spec_alpha () {
  git grep -l clojure.spec | xargs sed -i '' 's/clojure.spec /clojure.spec.alpha /g'
  git grep -l clojure.spec | xargs sed -i '' 's/clojure.spec.test /clojure.spec.test.alpha /g'
  git grep -l clojure.spec | xargs sed -i '' 's/clojure.spec.gen /clojure.spec.gen.alpha /g'
}

ghadishayban

;; differences from scheme unfold
;; even initial value is lazy
;; predicate sense reversed
;; internal state == produced value, no special mapper-fn
;; no tail-gen
(defn series
  "Produces a sequence of values.

   `f` is a function that given a value, returns the next value.
   `continue?` is a predicate that determines whether to produce

ikitommi

Specs & Schema for Clojure web apps

Common ground for different modelling libs (Spec, Schema, ...) for web usage.

Additional metadata on models

• for Schema, there are multiple ways to add extra metadata (at least in ring-swagger, schema-tools and in compojure-api)
• emerging tools for spec
• could have a common model
  • less syntax to learn