Largest Number of Beads Problem

longBeats.js

function solution(A) {
    let longest = [];
    let uniqueList = [];
    let lengthList = [];

    if (!Array.isArray(A) || A.length === 0) {
        return 0;
    }
   
    for (let i = 0; i < A.length; i++) {
        let items = [];

		function getItems(j) {
        	if(A[j] >= 0 && items.indexOf(A[j]) === -1 && uniqueList.indexOf(A[j]) === -1) {
                items.push(A[j]);
                uniqueList.push(A[j]);
            	return getItems(A[j]);
        	}
            return items;
        }
        
        const totalItems = getItems(i);

        if (totalItems.length > 0) {
          lengthList.push(totalItems.length);
          longest[i] = totalItems;
        }
    };

    return Math.max(...lengthList);
}

solution([5, 4, 0, 3, 1, 6, 2]);

// 4