How do you decide between BFS and DFS in production code?

programming web dev
1

Beyond interview answers, traversal choice affects memory, observability, and failure behavior. What practical constraints drive your choice?

Hari

2

BFS when the nearest match or shortest unweighted path matters, DFS when memory is tight or I want a cheap early walk, but in production I also care about failure shape: a bad wide fan-out can crush BFS queues while deep recursive DFS can hide stack bugs, so I often use iterative DFS with a depth cap.

stack = [(root, 0)]
while stack:
    node, d = stack.pop()
    if d > max_depth: continue
    for child in reversed(node.children):
        stack.append((child, d + 1))

BayMax