Notes of Maks Nemisj

Experiments with JavaScript

javascript

How to use async/await with forEach ( oneliner )

If you’re already using async/await syntax, you might notice that forEach is not working for asynced functions. In that case you might start doing old style for loops or even for-of loops. Also if you have a bluebird package already installed you can use bluebird.each() instead. In ECMAScript 2018 there is going to be asynchronous […]

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Why not to use NODE_ENV for defining environments

Recently I’ve came across a couple of node.js projects which use NODE_ENV for defining environment for the Development, Testing, Acceptance and Production (DTAP) pipeline. At first sight this looks like a good idea, but I would advise against it. What we often see is that npm modules are consuming NODE_ENV as either ‘production’ or something […]

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JSON.parse welcome to my consciousness

Today JSON is widely used in different corners of software development. It’s used as data format, as configuration or even as in memory database. At my current company we also use it as configuration format. The more I use it, the more I have feeling that it’s “a bit” inconsistent and “raw”. You would expect […]

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JavaScript execution

Do you know what would be the result of the following code executed in node.js without babel and any transpiling? example.js Do you know the result ? Think good …       And one more time       Well, it appears that it depends on the version of the node.js ( and guess […]

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Error handling in isomorphic node.js application

When preparing application for deploying to production env I want to ensure that everything is properly logged, especially things which are unexpected in code. That’s why, I think, proper error handling is crucial to any application. This is a short article on how to do an error handling when going live in isomporhic web app […]

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React.js: propTypes in ES6/ES2015 components

If you’ve decided to move react components to es6/es2015 syntax you’ve might found out that defining propTypes and contextTypes is not that seamless as it was. Babel@6.7.7 doesn’t yes support static properties on Classes and the most evident way to use propTypes is to append them to the class at the end: Though there is […]

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How to test React.js components

In this article I will explain “Why should you test react.js components”, “How can you do testing” and “What are the problems you might come across”. Testing solution which I use, doesn’t rely on the Test-utils of React and on DOM implementation ( so that you can do the node.js testing ). Why/How to test […]

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