data_structures.ts

class Queue<T> {
    private items: T[]
    constructor() {
        this.items = new Array<T>();
    }

    enqueue(element: T) {
        this.items.push(element);
    }

    dequeue() {
        return this.items.shift();
    }

    peek() {
        return this.items[0]
    }

    isEmpty() {
        return this.items.length === 0
    }

}

class Stack<T> {
    private items: T[]
    constructor() {
        this.items = new Array()
    }

    push(item: T) {
        return this.items.push(item)
    }
    
    pop() {
        return this.items.pop()
    }

    peek() {
        return this.items[this.items.length - 1]
    }
}