Function length() returns the length of the path, namely, the number of edges in the path.

Arguments：

• Path <path>

Returns：

• Length <number>

Common Usage

Example: Find the shortest paths within 5 steps from card CA001 to CA002, and return the length of found paths

n({_id == "CA001"}).e()[*:5].n({_id == "CA002"}) as paths
limit 1
return length(paths)