Evan Hahn EvanHahn

C++ I/O

cin.get
cin.unget
getline(cin, var)
cin >> var
cout is slow because it has to go to the operating system

Let's first talk about booleans, which you might already know, so I apologize if this is review. If you think you understand booleans completely, skip this puppy.

Booleans

A boolean is a variable type in many programming languages. It usually that something can be true or false, yes or no, on or off, 0 or 1.

I imagine booleans like lightswitches. They can either be on or off -- true or false.

Most languages have true and false, but they vary somewhat. C++ writes true and false, where Python has capitalized True and False. CoffeeScript supplements the classics and adds yes, no, on, and off. C kinda doesn't have them built-in, you have to make your own.

	# Idiot solution to this dailyprogrammer idea
	# <http://redd.it/yln9p>

	puts """abandonments
	abbreviating
	abbreviation
	abbreviators
	abecedarians
	aberrational
	abjectnesses

	// The most readable way (in my opinion)
	$(document).ready(function() {
	// your code here
	});

	// Alternate way that's supposedly faster
	$.fn.ready(function() {
	// your code here
	});

	# Destructive selection sort.
	# [1, 12, 8, 5].selectionSort()
	Array::selectionSort = ->

	# Look forward from each element.
	for num, i in this

	# Find the smallest element in this partition.
	smallest = null
	smallestIndex

	# Non-destructive merge sort.
	# [1, 8, 12, 5].mergeSort()
	Array::mergeSort = ->

	# If the array has one element, we're done.
	return this if @length is 1

	# Split the array in half.
	halfwayMark = Math.floor(@length / 2)
	firstHalf = @slice(0, halfwayMark)

	// Test my hypothesis that Object.is(a, b) is the same as a === b.
	// Log an error if they're different.
	var numTests = 0;
	function test(a, b) {
	if ((Object.is(a, b)) !== (a === b)) {
	console.error('Object.is is different from === for ' + a + ' and ' + b);
	}
	numTests ++;
	}

	# Non-destructive quicksort.
	# DOESN'T WORK WITH DUPLICATES. Too lazy.
	# [1, 5, 8, 12].quickSort()
	Array::quickSort = ->

	# Is the array already sorted by nature of its length?
	return this if @length <= 1

	# Pick a pivot as a random element.
	# This is probably not the best pivot we could choose.

	<!DOCTYPE html>
	<html>
	<head>

	<style type="text/css">
	body {
	-webkit-user-select: none;
	-khtml-user-drag: none;
	-khtml-user-select: none;
	-moz-user-select: none;

	// Load dependencies
	var express = require('express');
	var is = require('browseris');
	var fs = require('fs');

	// Build me an app!
	var app = express();
	app.set('port', process.env.PORT \|\| 3000);
	app.use(express.compress());