https://www.reddit.com/r/dailyprogrammer/comments/3d4fwj/20150713_challenge_223_easy_garland_words/

garland.js

if (process.argv.length !== 3) {
	console.log("Usage:", process.argv[1], "num")
	return;
}

var garland = function (word) {
	var degree = 0;
	for (var i = 1; i < word.length; ++i) {
		var front = word.slice(0, i);
		for (var j = 1; j <= i; ++j) {
			var back = word.slice(-j);
			if (front === back && front.length > degree) {
				degree = front.length;
			}
		}
	}
	return degree;
}

console.log(garland(process.argv[2]));