array.js

// Method for creation of array
function array(...arguments) {
  let arr = Object.create(array.prototype);
  Object.defineProperty(arr, "length", {
	value: 0,
  	enumerable: false,
  	writable: true
  })

  for(let i=0;i<arguments.length;i++) {
    arr[i] = arguments[i];
    arr.length += 1;
  }
  return arr;
}

// push method
array.prototype.push = function(element) {
  this[this.length] = element;
  this.length+=1;
}

// pop method
array.prototype.pop= function() {
  this.length -= 1;
  const returnValue = this[this.length];
  delete(this[this.length]);
  return returnValue;
}

// filter method
array.prototype.filter = function(callback) {
  let result = array();
  for(let index in this) {
    if(this.hasOwnProperty(index)) {
      const element = this[index];
      if(callback(element, index)) {
          result.push(element);
      }
    }
  }
  return result;
}

const friendsArray = array('Subham', 'Dewang', 'Aman');
console.log(friendsArray)
// friendsArray = {0: 'Subham', 1: 'Dewang', 2: 'Aman'}

console.log(friendsArray[1]) // Dewang

friendsArray.push('Rajat');
console.log(friendsArray);
// friendsArray = {0: 'Subham', 1: 'Dewang', 2: 'Aman', '3': 'Rajat'}
friendsArray.filter((element, index) => element.includes('m'));
// friendsArray = {0: 'Subham', 1: 'Aman'}