codility-solution3.js

/**
Solution for: http://codesnakers.com/projects/4.png
*/
function solution(S) {
    // write your code in JavaScript (Node.js 8.9.4)
	
	var len = S.length;
	if(typeof S !== "string" || len===0 || len>1000000 || len===undefined){
		return 0;
	}
	var prefixS, suffixS;
	for(var i=1; i<len; i++){
		prefixS = S.slice(i);
		suffixS = S.slice(0,len-i);
		/*console.log(prefixS, suffixS);*/
		if(prefixS === suffixS){
			return prefixS.length;
		}
	}
	return 0;
}