JavaScript Essentials

Understand where JavaScript runs and what it controls on a webpage.

Use const and let to store values.

Calculate, compare and combine values.

Run different code based on a decision.

Choose paths and repeat work.

Repeat actions and branch on values.

Write reusable logic with function declarations and arrow functions.

Model collections and structured data.

Respond to clicks and update page content.

Use modern syntax for clearer programs.

Extract values from arrays and objects clearly.

Copy, combine and collect values.

Split JavaScript into reusable files.

Represent work that finishes later.

Request external data using promises and async/await.

Write asynchronous code in a synchronous style.

Recover from expected failures.

Create objects with shared behavior.

Organize code and persist small browser values.

Keep values predictable and handle failures.