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import LinkedList from '../linked-list/LinkedList';

export default class Stack {

constructor() {

this.linkedList = new LinkedList();

}

/**

* @return {boolean}

*/

isEmpty() {

return !this.linkedList.tail;

}

/**

* @return {*}

*/

peek() {

if (this.isEmpty()) {

return null;

}

return this.linkedList.tail.value;

}

/**

* @param {*} value

*/

push(value) {

this.linkedList.append(value);

}

/**

* @return {*}

*/

pop() {

const removedTail = this.linkedList.deleteTail();

return removedTail ? removedTail.value : null;

}

/**

* @return {*[]}

*/

toArray() {

return this.linkedList

.toArray()

.map(linkedListNode => linkedListNode.value)

.reverse();

}

/**

* @param {function} [callback]

* @return {string}

*/

toString(callback) {

return this.linkedList.toString(callback);

}

}