When working with a SQL database, the SELECT command is used to retrieve data from a table. In this blog, we’ll explore how to effectively use the SELECT command to fetch and manipulate data. Retrieving All Rows and Columns To retrieve all rows and columns from a table, you can simply use the following query: SELECT * FROM people; This will return all the rows and columns in the “people” table....
The useCallback React hook is a powerful tool that can help optimize your React applications. In this blog post, we’ll explore what the useCallback hook is useful for and how to work with it effectively. First, let’s briefly review the basics of React hooks. If you’re new to hooks, I recommend checking out my previous blog post on React hooks introduction. What is the useCallback Hook? The useCallback hook is used to memoize a function so that it is not recreated on every render of a component....
Discover the benefits of using the useContext React hook and learn how to effectively work with it! If you’re new to React hooks, make sure to check out my React hooks introduction first. One of the most valuable React hooks I often use is useContext. To start utilizing the useContext hook, simply import it along with React: import React, { useContext } from 'react' This hook specifically complements the React Context API, unlocking its full potential....
In this tutorial, we will discuss how to utilize the useEffect callback with event callbacks, specifically focusing on socket.io connections in a React application. This will ensure that the client-side application displays the up-to-date value of a variable when the corresponding event is called on the server. Let’s consider the following code snippet: useEffect(() => { if (!socket) return socket.on('newuserconnected', (username) => { console.log(connectedusers); }); }, [socket]); Initially, we might assume that upon executing this code, the client-side application would log the current value of the connectedusers variable whenever the newuserconnected event is triggered on the server....
Discover the usefulness of the useEffect React hook and learn how to work with it! If you’re new to React hooks, I recommend checking out my React hooks introduction first. One of the React hooks that is commonly used is useEffect. import React, { useEffect } from 'react' The useEffect function is executed when the component is first rendered and on every subsequent re-render or update. React first updates the DOM, then calls the function passed to useEffect()....
In the world of React, one hook that can come in handy is useMemo. import React, { useMemo } from 'react'; The useMemo hook allows you to create a memoized value. This hook is similar to useCallback, but with a few differences. While useCallback returns a memoized callback, useMemo returns a memoized value, which is the result of a function call. Additionally, the use case for these two hooks is different....
Discover the practical uses of the useRef React hook and learn how to effectively use it in your projects! If you’re new to React hooks, make sure to check out my React hooks introduction first. One of the useful React hooks that I frequently use is useRef. It provides a way to access DOM elements imperatively. To start using the useRef hook, import it along with React: import React, { useRef } from 'react' Let’s take an example where we log the value of a DOM reference of a <span> element that contains the count value:...
The confirm() API provided by browsers allows us to ask for user confirmation before performing certain actions. This widely supported API has been around since the early days of the Web and can be a handy tool in various scenarios without the need for a custom-built user interface. To use the confirm() API, simply call the function and pass a string representing the confirmation message that you want to display to the user....
Discover how to utilize the top-level await feature in JavaScript, which is currently available in v8. Typically, you can only use await inside async functions. As a result, it’s common to declare an immediately invoked async function expression to wrap it: (async () => { await fetch(/* ... */); })(); Alternatively, you can declare a function and then call it: const doSomething = async () => { await fetch(/* ... */); }; doSomething(); However, with the introduction of top-level await, you can simply run:...
Distractions on the internet can be a major obstacle when trying to focus on work or solve problems. While there are several apps available to block websites, sometimes you may not want to block an entire site, but rather specific elements within it. This is where uBlock Origin can come in handy. In this article, we will discuss how to use uBlock Origin to block distractions on specific web pages....