sranso

def next_palindrome(palindrome)
  palindrome_string = palindrome.to_s
  # change middle digit for palindromes with odd number of digits
  if palindrome_string.length.odd?
    middle = palindrome_string.length / 2
    if palindrome_string[middle] == "9"
      palindrome_string[middle] = "0"
      middle_two = middle - 1, middle + 1
    else
      palindrome_string[middle] = palindrome_string[middle].to_i.next.to_s

sranso

def one_lap_around_the_track
  puts 'starting to go around the quarter-mile track!'
  yield if block_given?
  puts 'continuing to go around the quarter-mile track!'
  puts 'finished going around the quarter-mile track!'
end

one_lap_around_the_track { puts 'hurtles!!' }
one_lap_around_the_track { puts 'shot put!!' }
one_lap_around_the_track { puts 'long jump!!' }

sranso

class MyHash
  attr_reader :buckets

  def initialize
    @buckets = []
  end

  def assign_or_find_index(k)
    special_function(k) % 100
  end

sranso

require './hash-table'

describe MyHash do
  rspec_hash = MyHash.new

  describe '#assign_or_find_index' do
    it 'should return a number between 0 and 100' do
      random_string = (0...8).map { (65 + rand(26)).chr }.join
      expect(rspec_hash.assign_or_find_index(random_string)).to be_between(0, 100)
    end

sranso

// MEMOIZE, caching something
var slowFunction = function(x, y) {
  return x * y + 15;
};

var answers = {};

var memoize = function(fn) {
  return function() {
    var args = arguments;

sranso

// EXTEND, transfer functionality from one method / class to another
var Foo = function(name) {
  this.name = name;
}
 
var Speakable = {
  speak : function() { console.log("hi, i'm " + this.name) },
  highfive : function() { console.log("up top!"); }
}
 

sranso

// MEMOIZE, caching something
var slowFunction = function(x, y) {
  return x * y + 15;
};
 
var answers = {};
 
var memoize = function(fn) {
  return function() {
    var args = arguments;

sranso

// MEMOIZE, caching something
// generating ids for all the functions
// "crazy closures" allow for the vars / functions to live
// and behave the way we want them to.
(function() {
  var id = 0;
  function generateId() { return id++; };
  Function.prototype.id = function() {
    var newId = generateId();
    this.id = function() { return newId; };

sranso

var memoizedSlowFunction = memoize(slowFunction);
// memoizedSlowFunction is now pointing the function below,
// where fn = slowFunction
// function() {
//   var keys = Array.prototype.slice.call(arguments);
//   var fnId = fn.id();
  
//   if ( ! answers[fnId] ) {
//     answers[fnId] = {};
//   };

sranso

Feature: Adding and removing cookies to or from a cookie jar
  In order to get cookies from a cookie jar
  As a hungry person
  I want to enable a person to take a cookie from a jar
  
  Scenario: Taking one cookie from the jar
    Given there is a cookie jar
    And there are cookies
    When a hungry person takes one cookie from the jar
    Then give them those cookies