Welcome to the third part of the six-part Introduction to Node.js tutorial series. By the end of this tutorial, you will be able to:
Throughout this tutorial, you will be asked to think about the possible output of running certain code snippets, so make sure to get your favorite code editor or a browser-based IDE like repl.it or CodeSandbox ready.
Why use ES6? As you will see, it offers more concise and intuitive syntax, including template strings, arrow functions, modules, and classes. Its language features help make code more readable.
Modern web browsers can readily execute ES5, but ES6 doesn’t yet have full browser compatibility yet. To use the complete set of ES6 features today, you will need to transpile (or rewrite) your code back down to ES5 so it can be interpreted by current browsers. Transpiler tools like Babel and Traceur help make this process easier. You can use either tool to transpire ES6 either in the browser or the server.
thisextensively in this course but it's good to know how arrow functions handle
thisdifferently compared to regular functions. In regular functions, the
thiskeyword represented the object that called the function, which could be the
document, a button, etc. In arrow functions, there is no binding of
this. With arrow functions, the
thiskeyword always represents the object that defined the arrow function.
awaitpattern so it's important to become familiar with this syntax.
Take a moment to reflect on what you’ve learned in this tutorial and answer the following questions:
What are some benefits of using the arrow function?
What are some differences between
What is the benefit of using destructuring?
What does the spread
... operator do?
What are ES6 modules?
What is the benefit of using
await to perform asynchronous actions?
Arrow functions were introduced in ES6 and provide a simpler syntax for creating functions along with a more intuitive handling of this. With arrow functions, the this keyword always represents the object that defined the arrow function.
var variables can be updated and re-declared within its scope.
let variables can be updated but not re-declared within its scope.
const variables can neither be updated nor re-declared within its scope.
var is globally or function-scoped, whereas
let are blocked-scoped, so a variable declared within a block (e.g., the space in-between of the curly brackets of an
if...else statement) can only be accessed within that block.
The destructuring syntax allows you to easily extract data from arrays or objects into separate variables.
... syntax allows you to make a shallow copy of an object.
Modules allow developers to organize their codebase within separate files or components for better reusability, flexibility, shareability, and overall maintenance. Multiple modules can be composed together to create an application.
What did you like or didn't like about this post? Let me know what worked well and what can be improved. Your feedback is much appreciated!