linked-list.js

export default class LinkedList {
  constructor(value, ...rest) {
    this.value = value

    if (rest.length) {
      this.next = new LinkedList(...rest)
    }
  }

  add(value) {
    if (this.next) {
      this.next.add(value)
    } else {
      this.next = new LinkedList(value)
    }
  }

  has(value) {
    return (
      this.value == value ||
      !!(this.next && this.next.has(value))
    )
  }
}