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One of the most revolutionary features introduced as part of ECMAScript 2015 specification is modules (ESM). In April 2020, Node v14.0.0 landed without experimental modules warning. Even though it was still experimental, it felt like the right timing to adopt ESM for some toy projects and insignificant clients' work. MOCKING FUNCTIONS AND MODULES WITH JEST Mocking functions and modules with Jest. A JavaScript program can have several dependencies, internal and/or external, most likely represented by the list of imports on the very top of your script. To write deterministic, repeatable unit tests, we need to control the inputs, outputs and invocations of those dependencies. ROUNDING AND TRUNCATING NUMBERS IN JAVASCRIPT Rounding numbers with decimal precision requires a little bit of calculation and Math.round().Optionally we can use the toFixed() method that belongs to the Number prototype. The output type of toFixed() is a string which needs to be passed to a top-level function called parseFloat() to return a number.Unfortunately this seems to be

really slow.

CONFIGURE A LOCAL WORDPRESS DEVELOPMENT USING DOCKER Configure a local WordPress development using Docker. Published: 2019.07.04 | 3 minutes read One of the most popular articles on my website is “Configure a local WordPress development on macOS from scratch”.I have recently used Docker a lot so I decided to tackle the same subject again but this time using containers.. This is not a Docker tutorial although by following along you learn how JAVASCRIPT CONSOLE IN SUBLIME TEXT Hi Pawel, Thank you for your instructions for a sublime text 3. I was trying to set it for a several days and still it doesn't work for me. I installed package control THE RESIZE OBSERVER EXPLAINED LOOP THROUGH A COLLECTION OF DOM ELEMENTS Loop through a collection of DOM elements. It is easy to think of a collection of DOM elements as a regular JavaScript array. This is a gotcha that many beginners fall into (including myself). NodeLists don’t share all of the Array ’s prototype methods, but there are a CLONING DOM NODES AND HANDLING ATTACHED EVENTS Cloning DOM nodes and handling attached events. Published: 2017.06.27 | 4 minutes read I’m the creator and sole maintainer of Siema — a simple carousel library that gained quite unexpected popularity on Github (thanks by the way). I constantly look to improve it and work hard to drop some new features in every once in a while. RETURN MULTIPLE ELEMENTS FROM A COMPONENT WITH REACT 16 The basic way is to return an array of elements. To avoid warnings you have to add a key to each element, although it may not be needed in the future. const App = () => [ React 16 can return multiple elements

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React 16 can return multiple elements ️

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React 16 can return multiple elements ️ [ React 16 can return multiple elements ️

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React 16 can return multiple elements ️

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React 16 can return multiple elements ️ [ React 16 can return multiple elements ️

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React 16 can return multiple elements ️

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React 16 can return multiple elements ️