Make your own iterables in javascript

queue-5-of-7.ts

export class Queue<T> {
  constructor(private length: number, private data: T[] = []) {}

  add(record) {
    const length = this.data.unshift(record);
    if (length > this.length) {
      this.remove();
    }
  }

  remove() {
    this.data.pop();
  }

  size() {
    return this.data.length;
  }

  isMember(item: T) {
    if (this.data.indexOf(item) !== -1) {
      return true;
    } else {
      return false;
    }
  }
}