arangodb/Documentation/Examples/shell_collection-truncate

arango> col = db.examples;
[ArangoCollection 91022, "examples" (status new born)]
arango> col.save({ "Hallo" : "World" });
{ "_id" : "91022/1532814", "_rev" : 1532814 }
arango> col.count();
1
arango> col.truncate();
arango> col.count();
0