Wrap Up

Key takeaways

Let’s take a moment to reflect on what we’ve learned in this chapter:

• Arrow functions were introduced in ES6, and they provide a simpler syntax for creating functions. They also provide a more intuitive handling of this. The this keyword always represents the object that defined the arrow function.

• The var variables can be updated and redeclared within its scope. The let variables can be updated but not redeclared within its scope. The const variables can neither be updated nor redeclared within its scope. The var keyword is globally or function scoped, whereas const and let are block scoped. So, a variable declared within a block can only be accessed within that block.

• The destructuring syntax allows us to easily extract data from arrays or objects into separate variables.

• The spread … syntax allows us 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.

• The async/await statements simplify the syntax for making asynchronous calls with JavaScript. They make asynchronous code look like synchronous code. They help us avoid deeply nested promise chains that quickly lead to messy code.