Arrays - SUMA

collection of items (boolean , objects , strings)
Arrays are mutable , you can change any value
Array are objects , typeof return objects

  let marks_class_10 = [1,2,3,4, null, false , "Not present"];
  console.log(marks_class_10)
  console.log(marks_class_10[7]) // will be undefined beacuse index does not exits
  console.log("Length of array is "+marks_class_10.length)

  // modifying value
  marks_class_10[7] = 89 // Addding a new value to array
  console.log(marks_class_10[7])
  marks_class_10[1] = 98 // Modifying value , Arrays are mutable
  console.log(marks_class_10)
  console.log(typeof marks_class_10)