How to use lifecycle methods in React? Example Tutorial

Components in React are the building blocks of an application. Every component in React has a lifecycle. In simple terms, every component goes through several different phases or events during its lifetime. These phases are -

• Mounting
• Updating
• Unmounting

React provides several in-built methods for each of these phases. These methods are invoked at a certain time during the lifecycle of a component. Such methods are called lifecycle methods. This article will discuss some of the commonly used lifecycle methods in React.

How to count a number of words in given String in Java? [Solved]

Can you write a method in Java that accepts a String argument and returns a number of words in it? A word is a sequence of one or more non-space characters i.e. any character other than '' (empty String). This should be your method signature:

public int count(String word);

This method should return 1 if the input is "Java" and return 3 if the input is "Java, C++, Python". Similarly a call to wordCount("    ") should return 0. 

How to use String.matches() with Regular Expression in Java? Example Tutorial

String Matching Example in Java
The string matches method in Java can be used to test String against regular expressions in Java. The string matches() method is one of the most convenient ways of checking if a String matches a regular expression in Java or not. Quite often we need to write code that needs to check if String is numeric, Does String contains alphabets e.g. A to Z or a to Z, How to check if String contains a particular digit 6 times, etc. There are so many cases in Java programming where we need a regular expression. 

How to Prepare for Google Cloud Security Engineer Exam

The world is changing, so does the studying procedure. In today's world, everything is before us, any course, any certificate can be accomplished using a single gadget. But, maximum of us are deluded by assigning unmerited & boring courses, which lack in quality. In the path of this article, I'll be directing you to some splendiferous resources that would help you undoubtedly. To succeed in this target, I've vetted a tracing of tactics. In this plan, I've fractioned the sketch into three parts – accumulating wisdom via courses & books, and evaluating your gained wisdom into practice tests. Let's buckle down into the details of the Google Cloud Security Engineer Exam and analyze this exam, strategies, what it is to pass this exam. 

How to use Switch Statement and Expression in Java? Tutorial with Examples

Hello friends, welcome aboard to the journey to understand and enjoy Java! We meet once again today to discuss a really interesting topic in Java. But, before we get to the actual topic, let’s talk about a scenario.  Suppose you guys have an integer, which can take up to 5 values, and depending on the value, we perform some tasks. To give you an example, here is a little code on it :

int value;

Now, suppose this int can have up to 5 values associated with it. Let’s say {0, 1, 2, 3, 4}.

For each value, we need to do different processing. 

Understanding "Lifting State Up" in React - Example Tutorial

Introduction

If you have ever worked with React, then you know the importance of state management. The state is managed within the component and decides the component’s behavior. But as the application grows, the state is required to be shared among the different components. For such global state sharing, third-party libraries such as Redux are used.

Apart from managing the state inside a component or using redux for the global state, there is one more way to work with the state. This is called “lifting state up”. In this article, we will discuss what is “lifting state up” in React with the help of an example. 

Higher Order Components in React - Example Tutorial

As a React application grows, it becomes more and more complex. The number of components increases too. With increasing code, you may encounter situations where the same logic is being used in multiple components. Why write the same code everywhere when we can perform code reusability? It is important to understand code reusability and it is recommended to reuse code as much as possible. Higher-Order Components are one such technique. In this article, we will discuss what is Higher-Order Components with the help of a simple example.

How to Create Custom hooks in React.js? Example Tutorial

Introduction

The introduction of React hooks in React version 16.8 changed the React development completely. The web application development using React was mostly limited to class components because the state and lifecycle methods were not supported in the functional components. But with React hooks, the state can be used in functional components. Moreover, lifecycle methods like functionality can also be achieved using the useEffect hook. 

How to do Type checking in React using PropTypes? Example Tutorial

In React, data can be passed from a parent component to a child component as props. Props are the properties that contain immutable read-only data. A prop value is basically an object which can hold any number of values of different data types. Props are an essential part of a React application. If not handled properly, props can lead to potential bugs and conflicts. The main issue is the data type of the value that is being passed from one component to another. React provides type checking support that is very useful in such cases. In this article, we will discuss how to use type checking in React with the help of PropTypes. 

How to use React forms in JSX? Example Tutorial

Introduction

Forms are an essential part of web application development. You can find forms on almost every website you visit. Forms are important because they are used to handle input from the users. Websites will not function properly if there is no way for input handling. 

Input can be taken in various forms. The most common type of input is text input. Other forms of input are checkboxes, radio buttons, and ranges. 

In React, forms are created like they are created in HTML. The most important part of forms in React is handling them. In this article, we will discuss how to create forms in React and handle them. 

How to use "styled-components" in React? Example Tutorial

Introduction

Today, no website is complete without CSS. The user experience is heavily dependent on the CSS applied to the website. Without CSS, the website will look extremely unpleasant. So to make a website attractive and user-friendly, it is necessary to apply top-notch CSS. 

Since its introduction in 1996, CSS has changed a lot. Over time CSS has undergone many changes and lots of new features are added to it. Moreover, to make the developer comfortable, CSS frameworks, libraries, and tools are invented. One such tool is styled-components and in this article, we will discuss what are styled-components and how to use them in React. 

What is context API in React? Example Tutorial

Introduction
Props and state are essential parts of a React component. While the state is controlled within the component, props are passed to it from the parent component. In a huge React application, a global state is generally created to pass the data around. Through props can also be used to pass data around multiple components but that can lead to unwanted situations. To avoid such unwanted situations, React provides the Context API. In this article, we will discuss what Context API is and how (and why) it is used.