Method delete

specs/arrays/arraylist.solution.test.js:38–42

(index)

    return this.data[index];
  }
  delete(index) {
    const ans = this.data[index];
    this._collapseTo(index);
    return ans;
  }
  _collapseTo(index) {
    for (let i = index; i < this.length; i++) {
      this.data[i] = this.data[i + 1];