tedpennings

/*
 * This decorates Handlebars.js with the ability to load
 * templates from an external source, with light caching.
 * 
 * To render a template, pass a closure that will receive the 
 * template as a function parameter, eg, 
 *   T.render('template-name', function(t) {
 *       $('#somediv').html( t() );
 *   });
 */

tedpennings

<p>Modifying version ${dto.versionToExpire}. Currently, effective 
        ${feature.featureVersions[dto.versionToExpire].effectiveRange.startDate} to 
	    ${feature.featureVersions[dto.versionToExpire].effectiveRange.endDate}</p>

tedpennings

(defn power-of? [power number]
  "Returns true if a number is a power of another number, eg, 
      (power-of? 5 25) => true
      (power-of? 5 26) => false"
  (= 
    (mod 
       (/ 
	      (Math/log number) 
	      (Math/log power) ) 
       1 ) 

tedpennings

(def certainty 5)

(defn prime? [n]
   (if (= n 1)
      true
      (.isProbablePrime (BigInteger/valueOf n) certainty)))

(take 10001 
   (filter prime? 
      (take-nth 2 

tedpennings

(ns algorithms.hashtable)

; This is a programming assignment from my CS algorithms class.

(defn create-table [size]
    (let [empty-table (hash-map)]
       (loop [current 0
              table empty-table]
         (if (> size current)
            (recur (inc current)

tedpennings

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.ArrayList;

tedpennings

(ns stm-demo 
     (:import (java.util.concurrent TimeUnit Executors ScheduledExecutorService)))

;; concurrency basics

(def scheduler (Executors/newScheduledThreadPool 3))

scheduler

(class scheduler)

tedpennings

    private boolean parameterListsConflict(Map<String, String> map1,
            Map<String, String> map2) {
        if (map1.equals(map2)) {
            return true;
        }
        if (map1.size() > map2.size()) {
            return largerMapContainsAllEntriesInSmallerMap(map1, map2);
        } else {
            return largerMapContainsAllEntriesInSmallerMap(map2, map1);
        }

tedpennings

{ 
    "user":
    {
        "name": "Johnny Walker",
        "occupation": "Distiller",
        "location": (function() { alert("XSS 1!"); return "somewhere"})(),
        "_location_comment": "Once parsed unsafely, the location XSS will run automatically, as a self-executing function. JSON.parse can help with this, and jQuery's $.parseJSON uses it by default (as do $.ajax, etc)",
        "bio": "<script type='text/javascript'>alert('XSS 2!');</script>",
        "_bio_comment": "This XSS will execute once it is added to the DOM, if not properly escaped  before adding it. This is more of a persistent kind of XSS attack, typically from poor input validation on server side."
    }

tedpennings

private JsonNode searchForEntity(JsonNode node, String entityName) {
    // A naive depth-first search implementation using recursion. Useful
    // **only** for small object graphs. This will be inefficient 
    // (stack overflow) for finding deeply-nested needles or needles 
    // toward the end of a forest with deeply-nested branches.
    if (node == null) {
        return null;
    }
    if (node.has(entityName)) {
        return node.get(entityName);