# freeCodeCamp Challenge Guide: Breadth-First Search

## Solutions

Solution 1 (Click to Show/Hide)
``````function bfs(graph, root) {
// Distance object returned
var nodesLen = {};
// Set all distances to infinity
for (var i = 0; i < graph.length; i++) {
nodesLen[i] = Infinity;
}
nodesLen[root] = 0; // ...except root node
var queue = [root]; // Keep track of nodes to visit
var current; // Current node traversing
// Keep on going until no more nodes to traverse
while (queue.length !== 0) {
current = queue.shift();
// Get adjacent nodes from current node
var curConnected = graph[current]; // Get layer of edges from current
var neighborIdx = []; // List of nodes with edges
var idx = curConnected.indexOf(1); // Get first edge connection
while (idx !== -1) {
neighborIdx.push(idx); // Add to list of neighbors
idx = curConnected.indexOf(1, idx + 1); // Keep on searching
}
// Loop through neighbors and get lengths
for (var j = 0; j < neighborIdx.length; j++) {
// Increment distance for nodes traversed
if (nodesLen[neighborIdx[j]] === Infinity) {
nodesLen[neighborIdx[j]] = nodesLen[current] + 1;
queue.push(neighborIdx[j]); // Add new neighbors to queue
}
}
}
return nodesLen;
}
``````