noahlz

Environment

• GVim
• tmux (for vim-dispatch)
• Clojure
• Leiningen 2
• drip (https://github.com/flatland/drip)

Vim Plugins

noahlz

Bush league is a general term used to describe an action or thing as being amateur, inferior or crude. In a literal sense, it refers to a low quality minor-league in baseball not associated with any of the major league teams. The term originated from the state of minor-league fields that often were ringed with shrubs and bushes.

- Wikipedia

Secretly using StringBuffer to convert a number to a String

int value = getValue();
String valStr = value + "";

noahlz

public Result processCommand(Data data) {
  try {
    return doStuff();
    // fuck it, just catch everything
  } catch (Exception ex) {
    String message = ex.getMessage() != null ? message : "LOL OOPS!";
    return new Result(message);
  }
}

noahlz

;; See https://twitter.com/stevelosh/status/269269366992936960

(defn multi-update [m updates]
  (reduce (fn [m [k f & args]] 
            (update-in m k #(apply f % args))) 
    m updates))

;; user=> (multi-update {:a 1 :b 2 :c 3} [[[:a] 1 1 1][[:b] 1 1][[:c] 3 1 -2]])
;; {:a 4, :c 5, :b 4}

noahlz

import java.io.*;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * http://stackoverflow.com/q/12321837/7507
 */
public class GetLatestBuildNumber {
    
    private static final AtomicInteger number = new AtomicInteger();

noahlz

;; See http://stackoverflow.com/questions/12066020/in-clojure-why-i-need-to-write-doc-str-but-meta-str

;; Define a var foo that points to a function
(def foo (with-meta (fn [] (println "bar")) {:doc "prints bar"} ))
;=> #'user/foo
(foo)
;=> bar
;=> nil

;; We see the :doc in our foo metadata...but where's our REPL documentation?

noahlz

Organizing Clojure Projects

Presented by @stuartsierra

Stuart presented using a deck created with org-html-slideshow, a Clojure library for formatting org-mode notes as HTML slides.

General Code Structure / Organization

1. Be careful not to make function calls across component boundaries.
2. Protocols should be minimalistic. They should have the fundamental operations of your component.

noahlz

;; Robot from Joy of Clojure, Ch 7

(def bearings [{:x  0 :y  1}   ; move north
               {:x  1 :y  0}   ; move east
               {:x  0 :y -1}   ; move south
               {:x -1 :y  0}]) ; move west
(defn bot [x y bearing-num]
  {:coords [x y]
   :bearing ([:north :east :south :west] bearing-num)
   :forward (fn [] (bot (+ x (:x (bearings bearing-num)))

noahlz

;; adopted from http://www.datomic.com/company/resources/getting-started
;; Clojure 1.4.0

;; user=> 
(use '[datomic.api :only [q db] :as d])
;;=> nil

;; user=> 
(doc d/q)
;; -------------------------

noahlz

#!/bin/sh 

# Futile attempts keep BUG below to not potentially exit the script.
set +e +E    
trap '' ERR

# displays the prompt in light cyan.
# TODO: http://stackoverflow.com/q/6788777/7507 
    
echo -e "\e[00;36mEnter expressions, [Ctrl-C] to exit\e[00m"