1 Hour JavaScript

Learn JavaScript quickly in one hour and master the basics of programming, with in-demand concepts applicable to other languages and a highly marketable skill.

learn javascript through a concise one-hour tutorial series, using Chrome for best support and JSBin to run code and view outputs in a console.

Explore the roles of HTML, CSS, and JavaScript in building web pages, see how HTML structures content, CSS styles it, and JavaScript adds interactivity with alerts and real-time output.

Add a button in HTML that calls a JavaScript function using onclick. Define the function to perform actions such as alerting a message when the button is pressed.

Explore how button callbacks rely on exact function names like one, two, and three, and how this scales to many buttons, with a safety feature that blocks pop ups.

Learn to update on-page text with JavaScript by selecting a paragraph element by its id and setting its innerHTML, while naming functions clearly and debugging effectively.

Explore how variables in JavaScript work, using the var keyword to declare booleans, integers, and strings, initialize values, and display results with alerts.

Learn to create and combine variables using the plus operator for numbers and strings, observe how JavaScript concatenates when mixing types, and separate numbers from strings for display purposes.

Learn how to capture user input with a text input, assign an id, and use a JavaScript variable and document.getElementById to update the text display in real time.

Explore global and local variable scope in JavaScript functions and loops, and see why two levels of scope keep a variable inside a function from outside.

Save your 1 hour JavaScript project by logging in, using save as templates, and reopening it later, then prepare to start a slightly new project in the next tutorial.

Learn how to call functions within functions, reuse code across files, and design update loops in games to call player logic and score updates.

Explore how an if statement checks a condition and executes a code block when the condition is true, using equals comparisons, curly braces, and one-line forms to define the decision.

Explore how else statements extend if logic, using curly-brace blocks and change text variables, and understand variable scope and declaration to avoid undefined references.

Explore how JavaScript handles variable scope, including out-of-scope references inside and outside curly brackets, and why code can run despite warnings, with guidance to ship error-free code.

Learn how to modify style with JavaScript using document.getElementById and element.style to change colors and other properties. Explore how IDs vs tags control which elements update.