Category: JavaScript

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React Answers

How to add favicon with React and Webpack?

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Sometimes, we want to add favicon with React and Webpack.

In this article, we’ll look at how to add favicon with React and Webpack.

How to add favicon with React and Webpack?

To add favicon with React and Webpack, we can use the react-favicon library.

To install it, we run

npm install react-favicon

Then we use it by writing

import Favicon from "react-favicon";
//...

ReactDOM.render(
  <div>
    <Favicon url="/path/to/favicon.ico" />
  </div>,
  document.querySelector(".react")
);

to add the Favicon component and set the favicon location with the path prop.

Conclusion

To add favicon with React and Webpack, we can use the react-favicon library.

Categories
JavaScript Answers

How to compare two time strings in the format HH:MM:SS with JavaScript?

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Sometimes, we want to compare two time strings in the format HH:MM:SS with JavaScript.

In this article, we’ll look at how to compare two time strings in the format HH:MM:SS with JavaScript.

How to compare two time strings in the format HH:MM:SS with JavaScript?

To compare two time strings in the format HH:MM:SS with JavaScript, we can compare the time strings directly if the strings are in 24 hour format and there’s no am or pm in them.

For instance, we write

const str1 = "10:20:45";
const str2 = "05:10:10";

if (str1 > str2) {
  console.log("Time 1 is later than time 2");
} else {
  console.log("Time 2 is later than time 1");
}

to compare str1 and str2 directly.

The strings are in 24 hour format and there’s no am or pm in them, so we can do the comparison directly.

Conclusion

To compare two time strings in the format HH:MM:SS with JavaScript, we can compare the time strings directly if the strings are in 24 hour format and there’s no am or pm in them.

Categories
React Answers

How to use dotenv in a React project?

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Sometimes, we want to use dotenv in a React project.

In this article, we’ll look at how to use dotenv in a React project.

How to use dotenv in a React project?

To use dotenv in a React project, we create our React project with Create React App.

Then we can access environment variables from process.env.

We run

npx create-react-app my-app
cd my-app
npm start

to create the my-app project with create-react-app.

Then we can put our environment variables in an .env file.

And then we can access the variable with

const BASE_URL = process.env.REACT_APP_BASE_URL;

We can access any environment variable in .env that starts with REACT_APP_.

Conclusion

To use dotenv in a React project, we create our React project with Create React App.

Then we can access environment variables from process.env.

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JavaScript Answers

How to change CSS values with JavaScript?

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Sometimes, we want to change CSS values with JavaScript.

In this article, we’ll look at how to change CSS values with JavaScript.

How to change CSS values with JavaScript?

To change CSS values with JavaScript, we can get the rule from document.styleSheets and set the rule’s values.

For instance, we write

const cssRuleCode = document.all ? "rules" : "cssRules";
const rule = document.styleSheets[styleIndex][cssRuleCode][ruleIndex];
rule.selectorText = selector;
rule.value = value;

to get the rule we want to update with document.styleSheets[styleIndex][cssRuleCode][ruleIndex].

Then we set the selector text of the rule with

rule.selectorText = selector;

And we set the value of the rule with

rule.value = value;

Conclusion

To change CSS values with JavaScript, we can get the rule from document.styleSheets and set the rule’s values.

Categories
JavaScript Answers

How to create a simple HTTP proxy in Node.js?

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Sometimes, we want to create a simple HTTP proxy in Node.js.

In this article, we’ll look at how to create a simple HTTP proxy in Node.js.

How to create a simple HTTP proxy in Node.js?

To create a simple HTTP proxy in Node.js, we can use the http and http-proxy modules.

We install http-proxy by running

npm install http-proxy --save

Then we use it by writing

const http = require("http");
const httpProxy = require("http-proxy");
const proxy = httpProxy.createProxyServer({});

http
  .createServer((req, res) => {
    proxy.web(req, res, { target: "http://www.example.com" });
  })
  .listen(3000);

to create a proxy server with createProxyServer.

Then we call http.createServer with a callback to proxy our requests to http://www.example.com.

And we listen for requests on port 3000.

Conclusion

To create a simple HTTP proxy in Node.js, we can use the http and http-proxy modules.