Introduction In web development, asynchronous (aka, async) operation, such as API calling is inevitable for developer to not work with, and the basic foundation knowledge we need to know is...

Introduction CSS Specificity is one of the fundamentals concept in CSS. The first thing programmer usually learns in CSS is class and inline-style, but do you already understand how if we ha...

Introduction The amount of code increases as the complexity and business logics grows. Developer needs to think how to maintain and organize the files so it will be clear and easy to read. O...

Function is an essential building block in JavaScript. The purpose of using function is the same as defining procedure - a set of statements that performs a task or calculates a value. Moreo...