reborg

Rich Already Answered That!

A list of commonly asked questions, design decisions, reasons why Clojure is the way it is as they were answered directly by Rich (even when from many years ago, those answers are pretty much valid today!). Feel free to point friends and colleagues here next time they ask (again). Answers are pasted verbatim (I've made small adjustments for readibility, but never changed a sentence) from mailing lists, articles, chats.

How to use:

• The link in the table of content jumps at the copy of the answer on this page.
• The link on the answer itself points back at the original post.

Table of Content

antirez

# LVDB - LLOOGG Memory DB
# Copyriht (C) 2009 Salvatore Sanfilippo <antirez@gmail.com>
# All Rights Reserved

# TODO
# - cron with cleanup of timedout clients, automatic dump
# - the dump should use array startsearch to write it line by line
#   and may just use gets to read element by element and load the whole state.
# - 'help','stopserver','saveandstopserver','save','load','reset','keys' commands.
# - ttl with milliseconds resolution 'ttl a 1000'. Check ttl in dump!

Azel4231

;; "Can you model dependent types in clojure.spec?"

;; What are dependent types?
;; -> Parts of the data depend on each other
;; -> The structure of the data depends on certain values in the data itself

   [3 "A" "B" "C"]
;; [count & elements]

;; Valid:

djspiewak

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

fnky

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

• Ctrl-Key: ^[
• Octal: \033
• Unicode: \u001b
• Hexadecimal: \x1B
• Decimal: 27

ericnormand

#!/bin/sh
#_(

   #_DEPS is same format as deps.edn. Multiline is okay.
   DEPS='
   {:deps {clj-time {:mvn/version "0.14.2"}}}
   '

   #_You can put other options here
   OPTS='

Omar-Ikram

//
//  main.m
//  EndpointSecurityDemo
//
//  Created by Omar Ikram on 17/06/2019 - macOS Catalina 10.15 Beta 1 (19A471t)
//  Updated by Omar Ikram on 15/08/2019 - macOS Catalina 10.15 Beta 5 (19A526h)
//  Updated by Omar Ikram on 01/12/2019 - macOS Catalina 10.15 (19A583)
//  Updated by Omar Ikram on 31/01/2021 - macOS Big Sur 11.1 (20C69)
//  Updated by Omar Ikram on 07/05/2021 - macOS Big Sur 11.3.1 (20E241)
//  Updated by Omar Ikram on 04/07/2021 - macOS Monterey 12 Beta 2 (21A5268h)

hiredman

(require '[clojure.core.async.impl.protocols :as impl]
         '[clojure.core.async.impl.dispatch :as dispatch])

;;=> nil

(extend-type java.util.concurrent.CompletionStage
  impl/ReadPort
  (take! [this handler]
    (.whenCompleteAsync this
                        (reify

juskrey

(ns sentinel.auto
  (:require [taoensso.timbre :as timbre]
            [clojure.core.match.date :refer :all]
            [clojure.core.match :refer [match]]
            [clojure.core.match.regex :refer :all]
            [clojure.string :as st]
            [clojure.core.async :refer [chan close! buffer go-loop to-chan <! >! >!! <!!] :as async]
            [clojure.core.async.impl.protocols :as impl]
            [clojure.spec.alpha :as s]
            [clojure.core.async :as async]))

borkdude

(require '[clojure.java.shell :as sh]
         '[clojure.string :as str])

(defn format-arg [arg]
  (cond
    (symbol? arg) (str arg)
    (seq? arg) (let [f (first arg)]
                 (if (and (symbol? f) (= "unquote" (name f)))
                   (second arg)
                   arg))