hackerrdave

#!/bin/bash

sum() {
  local result=$(($1 + $2))
  echo $result
  return $result
}

sum 1 4
# 5

hackerrdave

#!/bin/bash

noisy_work() {
  not_a_real_command
} 2> /dev/null

sum() {
  noisy_work
  echo $(( $1 + $2 ))
}

hackerrdave

#!/bin/bash

sum() {
  echo $(( $1 + $2 ))
}

sum 1 4
# 5

hackerrdave

// Least Recently Used (LRU) Cache w/ Doubly-Linked List implemented in JavaScript
// By @hackerrdave

function LRUCache(capacity) {
  this.capacity = capacity;
  this.map = {}; //store mapping of key => linked-list node reference
  this.nodeCount = 0;
  this.cacheHead = new Node(null);
  this.cacheTail = this.cacheHead;
}

hackerrdave

// Priority Queue ADT w/ Max Heap implemented in JavaScript
// By @hackerrdave

function PriorityQueue() {
  this.heap = [null];
}

function PriorityQueueNode(value, priority) {
  this.value = value;
  this.priority = priority;

hackerrdave

// Quick Sort Algorithm implemented in JavaScript
// By @hackerrdave

function quickSort(arr) {
  if (arr.length < 2) {
    return arr;
  }
  
  let pivot = arr[0]; //let pivot point be the first element
  let lesser = []; //track elements < the pivot value

hackerrdave

// Merge Sort Algorithm implemented in JavaScript
// By @hackerrdave

function mergeSort(arr) {
  if (arr.length < 2) {
    return arr;
  }
  
  let midpoint = Math.floor(arr.length / 2);
  let leftHalf = arr.slice(0, midpoint); //slice an array of left-half items

hackerrdave

import Ember from 'ember';

export default Ember.Service.extend({
  eventInterval: 10000,

  schedulePollEvent(event, interval) {
    var eventInterval = interval || this.get('eventInterval');
    return Ember.run.later(()=>{
      event.apply(this);
      this.set('timer', this.schedulePollEvent(event));

hackerrdave

def pascal(c: Int, r: Int) = {
  
  def factorial(n: Int): Int =
    if (n == 0) 1 else n * factorial(n - 1)

  factorial(r) / ( factorial(c) * factorial(r - c) )
}   

hackerrdave

// app/routes/index.js

import Ember from 'ember';

export default Ember.Route.extend({
  authManager: Ember.inject.service(),

  currentUser: Ember.computed.alias('authManager.currentUser'),
});