React.memo() increases the performance of functional components by preventing useless renderings. But such performance tweaks must be applied wisely.

Overuse of implicit type conversion, old JavaScript tricks, polluting function scope, undefined & null, casual coding style ruin JavaScript code quality

forEach() in JavaScript calls the provided function on each array item with 3 arguments: item, index, the array itself. Learn how to use forEach().

Object spread allows easily to clone, merge, extend objects. While object rest collects rest of properties after destructuring.

A detailed explanation of how to architecture React components based on single responsibility principle, encapsulation and composition.

A detailed article about 'undefined' keyword in JavaScript. 7 tips on how to handle correctly 'undefined' and increase code durability.

The Voca library offers helpful functions to make string manipulations comfortable: change case, trim, pad, slugifly, latinise, sprintf, truncate, escape and more.

Check + and += operators use cases for writing short and concise expressions: sum numbers & measurements, concat strings & arrays, date manipulations.

Interesting dive into practices how to use 'self' keyword in Swift. Should you omit or always use 'self'? Find out the reasons and answer.

How to use Swift literals to initialize the 3 fundamental collection types: array, set and dictionary. Details about collection type inference.