iku000888

;; Given a seq of something and an async fn that accepts a callback,
;; how would you process the seq synchronously in order?

(def atm (atom []))
(reset! atm [])
(add-watch atm
           :watcha
           (fn [k r o n]
             (prn k o n)))

stuarthalloway

;; clojure.spec's missing piece, work in progress
;; this is only halfway done, somebody else will need to do the other 95%

(require
 '[clojure.spec :as s]
 '[clojure.spec.test :as test])

(defn naive-english-explain
  "Copy and paste this into your app. Figure out what it does by
trying it in production."

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

favila

(def tx-fns
  [{:db/ident :db.fn/reset-attribute-values
    :db/doc "Transaction function which accepts an entity identifier, attribute identifier
 and set of values and expands to any additions and retractions necessary to
 make the final post-transaction value of the attribute match the provided
 values. Attribute values must be scalars.
 
 If multiple values are provided on a cardinality-one attribute you will get a
 datom conflict exception at transaction time."
    :db/fn    (d/function

ShaneQful

npm ls | grep -oP "\w[^@]+@" | sed s/@// | sort |uniq | awk '{print "npm view " $1 " repository.url"}' | sh | grep -oP "github(\w|\W)+\.git" | sed 's/.git//g' | sed 's/.com/.com\/repos/g' | awk '{print "curl -s \"https://api."$1"\" | grep -P \"(stargazers_count|full_name)\" "}' | sh

jasongilman

Atom Clojure Setup

This describes how I setup Atom for an ideal Clojure development workflow. This fixes indentation on newlines, handles parentheses, etc. The keybinding settings for enter (in keymap.cson) are important to get proper newlines with indentation at the right level. There are other helpers in init.coffee and keymap.cson that are useful for cutting, copying, pasting, deleting, and indenting Lisp expressions.

Install Atom

Download Atom

The Atom documentation is excellent. It's highly worth reading the flight manual.

dtinth

My Atom hack (init script) for speed programming in Ruby. This code is very ugly but works.

Features

Upon saving,

• Ruby code in the specified directory is run.
• Test input data (after 1st __END__ but before 2nd __END__) is sent to the script via stdin.
• Output and/or errors are displayed in a popup.
• Program output is compared to test output data (after 2nd __END__). If it matches, then the popup becomes green.

robert-stuttaford

(ns onyx-tx-report-queue
  (:require [clojure.core.async :refer [>!! alts!! chan close! put! thread]]
            [clojure.tools.logging :as log]
            ;; :all so clj-refactor doesn't remove it:
            [onyx.plugin.core-async :refer :all] 
            [datomic.api :as d])
  (:import [java.util.concurrent TimeUnit]))

(defn prepare-datom [db [e a v tx added]]
  [e (d/ident db a) v tx added])

swannodette

(defn my-get
  "@param {*} m
   @param {*} k
   @return {nil|Object}"
  [m k]
  (get m k))

(defn foo
  "@param {!Object} x" ;; non-nullable
  [x] x)

dypsilon

Reactive Programming

• Introduction
  • The Reactive Manifesto
  • The introduction to Reactive Programming you've been missing
  • Ben Lesh Talks RxJS at Modern Web UI
  • 2 minute introduction to Rx
  • Why program with continuous time?
  • Video: Async and Streaming JavaScript, We're All Doing it Wrong! - Matthew Podwysocki
• Functional Programming