If / else statement inside of React Component’s Render method

Sometimes (well, actually pretty often) you have to use conditional statements inside of React Component’s Render methods. You could do it like this: import React from „react“; class MyComponent extends React.Component { render() { return ( <di> {„LGK“ == „awesome“ ? <h1>LGK is awesome!</h1> : <h1>LGK is not awesome :C</h1> } </div> ); } }… If / else statement inside of React Component’s Render method weiterlesen

Node.js: Check if you are in debug or production mode

Sometimes you have to use other values in a variable when your application is in production as if when you are debugging it. For example you have to use another web service URL. Here is how can do it: var webApiUrl; if (process.env.NODE_ENV === „production“) { // use in production webApiUrl = „http://myapp.online/awesome-app/api“; } else… Node.js: Check if you are in debug or production mode weiterlesen

JavaScript „hasClass()“, „addClass()“, „removeClass()“ helper functions

If you’re like me and come from jQuery to pure JavaScript, these helper functions might be very helpful for you: function hasClass(el, className) { if (el.classList) return el.classList.contains(className); else return !!el.className.match(new RegExp(‚(\\s|^)‘ + className + ‚(\\s|$)‘)); } function addClass(el, className) { if (el.classList) el.classList.add(className); else if (!hasClass(el, className)) el.className += “ “ + className; }… JavaScript „hasClass()“, „addClass()“, „removeClass()“ helper functions weiterlesen

Try to avoid loops in JavaScript for better performance

Use objects instead of arrays A benefit of objects is that you can directly call its children elements (properties) by name. While arrays only have index numbers. Here is a simple example: const exampleDataArray = [ { id: 8462943, name: „Google“, url: „http://google.com“ }, { id: 9847323, name: „Amazon“, url: „http://amazon.com“ }, { id: 938442934,… Try to avoid loops in JavaScript for better performance weiterlesen