delete specific key from every subdocuments code example

Example: delete specific key from every subdocuments

var deleteIdFromSubdocs = function (obj, isRoot) {
for (var key in obj) {
    if (isRoot == false && key == "_id") {
        delete obj[key];
    } else if (typeof obj[key] == "object") {
        deleteIdFromSubdocs(obj[key], false);
    }
}
return obj;