railsstudent

printerError = (s) ->
  goodAlphabet = "abcdefghijklm"
  errorCount = 0
  for x in s
    if x not in goodAlphabet then errorCount += 1
  "#{errorCount}/#{s.length}"

railsstudent

array_diff = (a, b) ->
  diff_array = []
  for e in a
    if e not in b then diff_array.push e  
  diff_array

railsstudent

var maxSequence = function(arr){
  
  let isAllNegative = arr.every((e) => e < 0);
  if (arr.length === 0 || isAllNegative) {
    return 0;
  }
  let isAllPositive = arr.every((e) => e > 0);
  if (isAllPositive) {
    return arr.reduce((a,b) => { return a + b }, 0);
  }

railsstudent

function decode(str) {
  var result = [];
  let idx = 0;
  let charCount = 0;
  let strCharCount = '';
  while (idx < str.length) {
    if (str[idx] === '\\') {
      // parse digits
      strCharCount = '';
      idx += 1;

railsstudent

function sierpinski(n) {
  if (n === 0) {
    return 'L';
  }
  let tri = sierpinski(n - 1);

  let triRows = tri.split('\n');
  let gap = 2 * triRows.length - 1;
  let arr = triRows.reduce((arr, r) => {
    arr.push(r + ' '.repeat(gap) + r);

railsstudent

function convert(input, source, target) {
  if (source === target) {
    return input;
  }

  // Compute the value of the input in source base
  // then convert it to value in target base
  let sourceValue = input.split('').reverse().reduce( (acc, val, digitPos) => {
    return acc + Math.pow(source.length, digitPos) * source.indexOf(val);
  }, 0);

railsstudent

// http://stackoverflow.com/questions/8002252/euler-project-18-approach
function longestSlideDown (pyramid) {
  let pyramidSum = [];
  pyramid.forEach((r, i) => {
    pyramidSum.push(r.map((e) => {
      return (i === pyramid.length - 1) ? e : 0;
    }));
  });

  for (let i = pyramidSum.length - 2; i >= 0; i--) {

railsstudent

function stripUrlParams(url, paramsToStrip){

  let [urlPath, urlParams] = url.split('?');
  let paramKVMap = {};
  let urlDistinctParams = ''
  if (urlParams) {
      urlParams.split('&').forEach((e) => {
        let [key, val] = e.split('=');
        if (!paramsToStrip || !paramsToStrip.includes(key)) {
          if (!paramKVMap[key]) {

railsstudent

function getPINs(observed) {
//  return [observed].concat(getPINsHelper(observed));
//  return getPINsHelper(observed);
  let adjacentPins = {
    '1': ['1','2','4'],
    '2': ['1','2','3','5'],
    '3': ['2','3','6'],
    '4': ['1','4','5','7'],
    '5': ['2','4','5','6','8'],
    '6': ['3','5','6','9'],

railsstudent

"use strict";

var Observable = Rx.Observable;

var textbox = document.getElementById("textbox");
var textArea = document.getElementById("results");

var keypresses = Observable.fromEvent(textbox, 'keypress');

keypresses.forEach(function (x) {