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export class Objex<K, V>  extends Map<K, V> {	private array: [K, V][] | null = [];	private valueArray: V[] | null = [];	private keyArray: K[] | null = [];	public ['constructor']: typeof Objex;
	/**	 * Creates a new Objex collection	 * @param {[K, V][]} [entries] - The pre-defined values to add to Objex	 */	public constructor(entries?: [K, V][]) {		super(entries!);	}
	/**	 * Get the size of the collection	 * @returns {Number} The size of the collection	 */	public get size(): number {		return super.size;	}
	/**	 * Set a new entry in the Objex collection	 * @param {K} key - The key of the entry 	 * @param value - The value of the entry	 * @returns {Objex} The Objex class instance	 */	public set(key: K, value: V): this {		this.keyArray = this.valueArray = this.array = null;		return super.set(key, value);	}
	/**	 * Get a value from the Objex collection	 * @param {K} key - The key to get	 * @returns {V | undefined} The value or `undefined` if no value found	 */	public get(key: K): V | undefined {		return super.get(key);	}
	/**	 * Checks if an entry exists	 */	public has(key: K): boolean {		return super.has(key);	}
	/**	 * Delete an element from the Objex	 * @returns {boolean} If the element was deleted	 */	public delete(key: K): boolean {		this.keyArray = this.valueArray = this.array = null;		return super.delete(key);	}
	/**	 * Clears the whole Objex collection	 */	public clear(): void {		this.keyArray = this.valueArray = this.array = null;		return super.clear();	}
	/**	 * Fetch the first value(s) from the Objex 	 * @param {number} [amount=0] - The number of values from the beginning	 * @returns {V | V[] | undefined} A single value or an array of values if a number was provided	 */	public first(amount: number = 0): V | V[] | undefined {		const mapIter = this.values();		if (!amount || isNaN(amount) || amount < 0) return mapIter.next().value;
		amount = Math.min(amount, this.size);		return Array.from({ length: amount }, (): V => mapIter.next().value);	}
	/**	 * Fetch the last value(s) from the Objex 	 * @param {number} [amount=0] - The number of values from the end	 * @returns {V | V[] | undefined} A single value or an array of values if a number was provided	 */	public last(amount: number = 0): V | V[] | undefined {		const vArray = this.vArray();		if (!amount || isNaN(amount) || amount < 0)			return vArray[vArray.length - 1];
		amount = Math.min(amount, this.size);		return vArray.slice(-amount);	}
	/**	 * Fetch the first key(s) from the Objex 	 * @param {number} [amount=0] - The number of keys from the beginning	 * @returns {K | K[] | undefined} A single key or an array of keys if a number was provided	 */	public firstKey(amount: number = 0): K | K[] | undefined {		const keyIter = this.keys();		if (!amount || isNaN(amount) || amount < 0) return keyIter.next().value;
		amount = Math.min(amount, this.size);		return Array.from({ length: amount }, (): K => keyIter.next().value);	}
	/**	 * Fetch the last key(s) from the Objex 	 * @param {number} [amount=0] - The number of keys from the end	 * @returns {K | K[] | undefined} A single key or an array of keys if a number was provided	 */	public lastKey(amount: number = 0): K | K[] | undefined {		const kArray = this.kArray();		if (!amount || isNaN(amount) || amount < 0)			return kArray[kArray.length - 1];
		amount = Math.min(amount, this.size);		return kArray.slice(-amount);	}
	/**	 * Get a `[key, value]` pair array of the Objex	 * @returns {[K, V][]} The array of all the entries	 */	public toArray(): [K, V][] {		if (this.array!.length !== this.size) this.array = [ ...this.entries() ];		return this.array!;	}
	/**	 * Get an array of all the Objex values	 * @returns {V[]} The array of all the values	 */	public vArray(): V[] {		if (this.valueArray!.length !== this.size)			this.valueArray = [ ...this.values() ];		return this.valueArray!;	}
	/**	 * Get an array of all the Objex keys	 * @returns {K[]} The array of all the keys	 */	public kArray(): K[] {		if (this.keyArray!.length !== this.size) this.keyArray = [ ...this.keys() ];		return this.keyArray!;	}
	/**	 * Let's you run a function on each Objex element	 * @param func - The function that is to be ran on each element	 * @returns {T[]} The final result in an array	 */	public map<T>(func: (val: V, key: K, objex: this) => T): T[] {		const raw = this.entries();		return Array.from({ length: this.size }, (): T => {			const [ key, value ] = raw.next().value;			return func(value, key, this);		});	}
	/**	 * Filters the elements that passes a test	 * @param {Function} func - The function that needs to be satisfied 	 * @returns {Objex} The filtered Objex collection	 */	public filter<T>(func: (val: V, key: K, objex: this) => boolean): this {		const filtered = new this.constructor[Symbol.species]<K, V>() as this;		for (let [ key, value ] of this) {			if (func(value, key, this)) filtered.set(key, value);		}		return filtered;	}
	/**	 * Find an element value that passes a test	 * @param {Function} func - The function that needs to be satisfied 	 * @returns {V | undefined} The value or `undefined` if none found	 */	public find<T>(		func: (val: V, key: K, objex: this) => boolean	): V | undefined {		for (let [ key, value ] of this) {			if (func(value, key, this)) return value;		}		return undefined;	}
	//public some<T>(func: ())}