#Common_Beginner_Mistakes_with_React

Question number: 1

Who can find the bug here? 😉

@Diyorbekk_dev

#Common_Beginner_Mistakes_with_React

Question number: 2

Who can find the bug here? 😉

@Diyorbekk_dev

Answer

React relies on an state variable's identity to tell when the state has changed. When we push an item into an array, we aren't changing that array's identity, and so React can't tell that the value has changed.

How to fix it: We need to create a brand new array. Here's solution

function handleAddItem(value) {
  const nextItems = [...items, value];
  setItems(nextItems);
}

@Diyorbekk_dev

#JavaScript

How do you decode or encode a URL in JavaScript?

 encodeURI() 

function is used to encode an URL. This function requires a URL string as a parameter and return that encoded string.

 decodeURI() 

function is used to decode an URL. This function requires an encoded URL string as parameter and return that decoded string.

Note: If you want to encode characters such as / ? : @ & = + $ # then you need to use

 encodeURIComponent(). 

@Diyorbekk_dev

#JavaScript

What is memoization ?

Memoization is a technique used in computer programming to optimize the performance of a function by caching its results based on its input parameters.

The goal is to avoid redundant computations for the same set of inputs.

on the picture, a simple example of adding function with memoization in JavaScript .

@Diyorbekk_dev