Untitled

let fruits = ["apple", "banana", "orange", "melon", "berry"];
console.log(fruits[2]);
fruits.push("water melon");
fruits.pop();

let person = {
  name: "Sayf",
  age: 16,
  profession: "programmer"
};
console.log(person.age);
person.profession = "teacher";

for (let i = 0; i < fruits.length; i++) {
  console.log(fruits[i]);
}

Object.keys(person).forEach(key => {
  console.log(key + ": " + person[key]);
});



function removeFruitByIndex(index) {
  if (index >= 0 && index < fruits.length) {
    fruits.splice(index, 1);
  } else {
    console.log("Index out of range");
  }
}

function updatePersonProperty(propertyName, newValue) {
  if (person.hasOwnProperty(propertyName)) {
    person[propertyName] = newValue;
  } else {
    console.log("Property not found");
  }
}

let matrix = [
  [1, 2, 3],
  [4, 5, 6]
];
console.log(matrix[1][2]);
matrix[0].splice(1, 1);

function printMatrix(matrix) {
  for (let i = 0; i < matrix.length; i++) {
    console.log(matrix[i].join(" "));
  }
}

var fruitlength = fruits.map(function(fruit) {
    return fruit.length;
});

function calculateAverageAge(persons) {
  if (persons.length === 0) return 0;
  let totalAge = 0;
  for (let i = 0; i < persons.length; i++) {
    totalAge += persons[i].age;
  }
  return totalAge / persons.length;
}