SOURCE

class Node {
    constructor(value) {
        this.value = value
        this.next = undefined
    }
}


class LinkedList {

    constructor() {
        this.head = null
        this.count = 0
    }

    push(value) {
        const node = new Node(value)
        if (!this.head) {
            this.head = node
        } else {
            current = this.head
            while(current.next != null) {
                current = current.next
            }
            current.next = node
        }
    }
}