//Queue -> FIFO (FIRST IN FIRST OUT)


function createQueue() {
    const queue = []

    return {
        enqueue: function(item){
            queue.unshift(item)
        },
        dequeue: function(item){
            queue.pop(item)
        },
        isEmpty: function(){
            return queue.length === 0
        },
        peek: function(){
            return queue[queue.length - 1]
        },
        length: function(){
            return queue.length
        }

    }

}


const q = createQueue()

console.log(q.enqueue(1))
console.log(q.length())
console.log(q.enqueue(2))
console.log(q.length())