image

usemap in can use map property by id and name

hierarchical relationship

• In hierarchy, there is ‘is-a’ relationship.
• Superclass is called when it is at top, the one below is called subclass.

mobx -> state management library
mobx-react-lite allows to work with hook

Singly-Linked List

9. Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.

7. Given a 32-bit signed integer, reverse digits of an integer.

1. Given an array of integers, return indices of the two numbers such that they add up to a specific target.

sorted() vs. sort()

• sort() makes change in place which return NONE, while sorted() will make copy of sorted list, which keep original list

to interact with database, use PDO()

fetchAll() -> give associate array, and index array
generetic objects

why do we need https?

Normal http does not contain validation. In the real world, when we use online banking or any website,