dherman

Motivation

• expression-oriented programming one of the great advances of FP
• expressions plug together like legos, making more malleable programming experience in-the-small

Examples

Write in an expression-oriented style, scoping variables as locally as possible:

NickCraver

private static readonly string[] tenHoursOfFun =
{
    "https://www.youtube.com/watch?v=wbby9coDRCk",
    "https://www.youtube.com/watch?v=nb2evY0kmpQ",
    "https://www.youtube.com/watch?v=eh7lp9umG2I",
    "https://www.youtube.com/watch?v=z9Uz1icjwrM",
    "https://www.youtube.com/watch?v=Sagg08DrO5U",
    "https://www.youtube.com/watch?v=5XmjJvJTyx0",
    "https://www.youtube.com/watch?v=IkdmOVejUlI",
    "https://www.youtube.com/watch?v=jScuYd3_xdQ",

untrusted-lvl20-solution.js

/*****************
 * bossFight.js *
 *****************
 *
 * NO FARTHER, DR. EVAL!!!!
 * YOU WILL NOT GET OUT OF HERE ALIVE!!!!
 * IT'S TIME YOU SEE MY TRUE FORM!!!!
 * FACE MY ROBOT WRATH!!!!!
 */

untrusted-lvl13-solution.js

/*
 * robotMaze.js
 *
 * The blue key is inside a labyrinth, and extracting
 * it will not be easy.
 *
 * It's a good thing that you're a AI expert, or
 * we would have to leave empty-handed.
 */

sedm0784

g_LastCtrlKeyDownTime := 0
g_AbortSendEsc := false
g_ControlRepeatDetected := false

*CapsLock::
    if (g_ControlRepeatDetected)
    {
        return
    }

josegonzalez

- certain endpoints are always blocked
if nginx_uri == "/_access_token" or nginx_uri == "/_me" then
    ngx.exit(403)
end

-- import requirements
local cjson = require "cjson"

-- setup some app-level vars
local app_id = "APP_ID"

ydaniv

// polyfill window.getMatchedCSSRules() in FireFox 6+
if ( typeof window.getMatchedCSSRules !== 'function' ) {
    var ELEMENT_RE = /[\w-]+/g,
            ID_RE = /#[\w-]+/g,
            CLASS_RE = /\.[\w-]+/g,
            ATTR_RE = /\[[^\]]+\]/g,
            // :not() pseudo-class does not add to specificity, but its content does as if it was outside it
            PSEUDO_CLASSES_RE = /\:(?!not)[\w-]+(\(.*\))?/g,
            PSEUDO_ELEMENTS_RE = /\:\:?(after|before|first-letter|first-line|selection)/g;
        // convert an array-like object to array

EvilFaeton

# CPU
for cpu in 1 2 ; do
   ( while true; do true; done ) &
done

# IO
for cpu in 1 2 ; do
   ( while true; do find / -type f -exec cp {} /dev/null \; ; done ) &
done

whylom

# Shell out to the fast and reliable `wc` utility.
def lines(path)
  # output of wc (returned by backticks) is formatted like this:
  # "     111 filename.ext"
  `wc -l #{path}`.strip.split(' ').first.to_i
end

# **/* gets all files and directories in all subdirectories.
files = Dir["/path/to/directory/**/*"]