'use strict';
|
|
|
|
module.exports = function keys() {
|
|
var collection = Object.keys(this.items);
|
|
|
|
if (Array.isArray(this.items)) {
|
|
collection = collection.map(Number);
|
|
}
|
|
|
|
return new this.constructor(collection);
|
|
};
|