zelark

Lessons learned; The nice and accurate counsel of Alex Miller, programmer

TL:DR

• Be intentional
• Stay connected to the problem
• Use tables to explore alternatives
• Make a picture

1. Read the docs!

zelark

(defn eager-map [f coll]
  (when-first [x coll]
    (println "iteration")
    (cons (f x)
          (eager-map f (rest coll)))))

(defn lazy-map [f coll]
  (lazy-seq
   (when-first [x coll]
     (println "iteration")

zelark

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define HASHMAP_SIZE 16

typedef struct entry_t {
  char *key;
  char *value;
  struct entry_t *next;

zelark

(ns zelark.small-life
  (:require [clojure.pprint :refer [pprint]]))

(defn empty-board
  "Creates a rectangular empty board of the specified width
   and height."
  [w h]
  (vec (repeat w (vec (repeat h nil)))))

(defn populate

zelark

#include "mpc.h"
#include <editline/readline.h>

#define LASSERT(args, cond, fmt, ...) \
  if (!(cond)) { \
    lval* err = lval_err(fmt, ##__VA_ARGS__); \
    lval_del(args); \
    return err; \
  }

zelark

(def input [1,12,2,3, 1,1,2,3, 1,3,4,3, 1,5,0,3, 2,13,1,19, 1,5,19,23, 2,10,23,27, 1,27,5,31, 2,9,31,35, 1,35,5,39, 2,6,39,43, 1,43,5,47, 2,47,10,51, 2,51,6,55, 1,5,55,59, 2,10,59,63, 1,63,6,67, 2,67,6,71, 1,71,5,75, 1,13,75,79, 1,6,79,83, 2,83,13,87, 1,87,6,91, 1,10,91,95, 1,95,9,99, 2,99,13,103, 1,103,6,107, 2,107,6,111, 1,111,2,115, 1,115,13,0, 99,2,0,14, 0])

(defn add [m p1 p2 p3]
  (let [a (get m p1)
        b (get m p2)]
    (assoc m p3 (+ a b))))

(defn mul [m p1 p2 p3]
  (let [a (get m p1)
        b (get m p2)]

zelark

Problem:

xcrun: error: invalid active developer path (/Applications/Xcode.app/Contents/Developer/), missing xcrun at: /Applications/Xcode.app/Contents/Developer/usr/bin/xcrun

Solution:

xcode-select --install

# optional

zelark

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 below in the summary jumps at the answer on this page.
• The link on the question itself points back at the original post.

Summary

zelark

Clojure Programming: Blog

• Part 1: Начало статического блога. Immutant, Ring, Compojure, HTML rendering через Rum
• Part 2: Forms, middlewares, redirects, 404 and error handling
• Part 3: id generator, loops, cookies, sessions, authorization, working w/ files, macros
• Part 4: Cookies, рефакторинг, неймспейсы, RSS фид
• Part 5: Infinite Scroll на JS, sitemap.xml, robots.txt
• Part 6: Настраиваем CLJS окружение
• Part 7: Переделываем форму редактирования на Rum, клиент+сервер-сайд рендеринг, EDN-сериализация данных
• Part 8: CLJS, drag-n-drop upload, browser API, Rum mixins, local state

zelark

;; For supporting more PG types, see https://github.com/remodoy/clj-postgresql
(ns pg-test.types
  (:require [cheshire.core :as json]
            [clojure.java.jdbc :as jdbc])
  (:import  [org.postgresql.util PGobject]
            [java.sql PreparedStatement]))


;; Writing
(defn- to-pg-json [data json-type]