Browse through the list of least popular xkcd comics

least popular xkcd browser

// ==UserScript==
// @name        least popular xkcd browser
// @description	Browse through the list of least popular xkcd comics
// @namespace   http://www.reddit.com/user/roastedlasagna
// @author			roastedlasagna
// @include			/^https?:\/\/(www\.)?xkcd\.com\/(\d+\/)?$/
// @version     1
// @grant       none
// ==/UserScript==

/* Use left and right arrow keys while on xkcd.com to navigate between the list of least popular comics. */

var list = [4, 7, 12, 24, 35, 39, 46, 47, 49, 62, 65, 68, 71, 76, 81, 82, 92, 98, 104, 106, 113, 116, 121, 127, 160, 170, 197, 201, 212, 215, 216, 226, 230, 268, 324, 336, 340, 345, 354, 355, 358, 369, 372, 381, 402, 423, 453, 470, 480, 511, 521, 535, 536, 637, 650, 662, 665, 709, 711, 797, 812, 818, 822, 847, 872, 885, 886, 894, 901, 929, 942, 943, 976, 1003, 1005, 1006, 1017, 1021, 1041, 1059, 1064, 1121, 1125, 1126, 1136, 1142, 1154, 1188, 1230, 1249, 1284];

var leftNum;
var rightNum;
var num;

function main(){
	getComicNumber();
	getLeftAndRight();
}
function getComicNumber(){
  theurl = document.URL;
  num = theurl.slice(theurl.indexOf("m/")+2, theurl.length-1);
	leftNum = num;
	rightNum = num;
}
function getLeftAndRight(){
	for (var i=0; i<list.length; i++){
		if (list[i] > num){
			rightNum = list[i]
			i = 1000;
		}
	}
	for (var j=list.length; j>0; j--){
		if (list[j] < num){
			leftNum = list[j];
			j = -1;
		}
	}
}

$(document).keydown(function(e) {
	switch(e.which) {
		case 37: // left
			window.location.href = "http://www.xkcd.com/" + leftNum;
			break;
		case 39: // right
			window.location.href = "http://www.xkcd.com/" + rightNum;
			break;
		default: return;
	}
	e.preventDefault();
});

main();