MongoDB: Find which DB contains a collection

gistfile1.js

var findCollection = function(colName) {
	var db_list = db.adminCommand('listDatabases')
	var allDbs = db_list.databases.map(function(x) { return (x['name']) })
	allDbs.map(function(x) { 
		db = db.getMongo().getDB(x);
		var cols = db.getCollectionNames();
		if (cols.indexOf(colName) > 0) {
			print(x);
		}
	});
}

findCollection('sneaky');