Average game times for League of Legends match history display.

LoL Average Game Time.js

function get_game_times() {
	var durs = document.querySelectorAll('.date-duration-duration'),
		games = Array();
	for ( i in durs) {
		var dtxt = durs[i].innerText;
		if (dtxt != undefined) {
			// Does it output hours? i have no appplicable data to test.
			var tar = dtxt.match(/(\d\d):(\d\d)/),
				tm = Number(tar[1]),
				ts = Number(tar[2])/60, // convert seconds to percentage
				t = tm + ts;
			games.push(t);
		}
	}
	return games;
}

function summery_text (games, totaltime, sep) {
	if (sep == undefined){	sep ='\n';	}
	var average = totaltime/games.length,
		summery =  "Total Time : " +totaltime.toString() + sep + 
		"Number of Games: " + games.length + sep + 
		"Average Time: " + average.toString() + sep +
		"Note time value format is: '<Minutes>.<SecondsAsAPercentage>'";
	return summery;
}

function sum (ar) {
	var t = 0;
    for (var i = 0; i < ar.length; i++) { t += ar[i]; }
    return t;
}
var games = get_game_times(),
	totaltime = sum(games);
//alert(games);
alert(summery_text(games, totaltime));