Many programming languages support the concept of a default argument for a function parameter so that the caller does not always need to specify the argument value. Unfortunately, ES5 does not have a default argument support in its syntax. ES6 functions have come a long way by taking aboard the years of complaints and improving parameter handling that is less error-prone and more powerful.

Flux is the application architecture that Facebook uses for building client-side web applications. It complements React’s composable view components by utilizing a unidirectional data flow. It’s more of a pattern rather than a formal framework.

To loop over an array or a collection JavaScript has been traditionally using for loops. ES5 introduced the for ..each loop. But ES6 introduces a little shorter version, a new interface for iteration called Iterable.

A module is a self-contained unit of code, which is usually stored in a file. In ES6, modules get language-level support for component definition. Modules export values, which can then be imported by other modules.

Sass control directives helps creating libraries for reuse and distribution, there by contribute to writing leaner Sass. Advanced frameworks use mixins. These mixins use directives such as @if, @for, each and @while.

If you are familiar with JavaScript, you have probably known the term scope. If you are familiar with other languages, you would know that a scope of a variable is to the nearest block – block scope. But JavaScript is different. A variable created with var will be scoped to the nearest parent function.

Gulp is a JavaScript task runner. It’s an alternative to Grunt, which allowed you to define your tasks using JavaScript inside of a file called Gruntfile.js. In this tutorial, I’ll show you how to install Gulp and create a simple configuration file to get your feet wet with this great new task runner.

The destructuring assignment syntax is a JavaScript expression in ES6 that makes it possible to extract data from arrays or objects using a syntax that mirrors the construction of array and object literals.

Webpack is a module bundler. Webpack takes modules with dependencies and generates static assets representing those modules.