array.es6.js

class MyArray {
  constructor() {
    this.array = [];
  }

  add(data) {
    this.array.push(data);
  }

  remove(data) {
    this.array = this.array.filter(current => current !== data);
  }

  search(data) {
    const foundIndex = this.array.indexOf(data);
    if(~foundIndex) {
      return foundIndex;
    }

    return null;
  }

  getAtIndex(index) {
    return this.array[index];
  }

  length() {
    return this.array.length;
  }

  print() {
    console.log(this.array.join(' '));
  }
}

const array = new MyArray();
array.add(1);
array.add(2);
array.add(3);
array.add(4);
array.print(); // => 1 2 3 4
console.log('search 3 gives index 2:', array.search(3)); // => 2
console.log('getAtIndex 2 gives 3:', array.getAtIndex(2)); // => 3
console.log('length is 4:', array.length()); // => 4
array.remove(3);
array.print(); // => 1 2 4
array.add(5);
array.add(5);
array.print(); // => 1 2 4 5 5
array.remove(5);
array.print(); // => 1 2 4