Learn JavaScript Quick start Guide for Beginners

Demonstrate cleaning a JavaScript array by removing duplicates with a new set, filtering out empty and false values, and producing a fully cleaned, unique result for console output.

Explore five ways to loop through arrays in JavaScript, including for loop, while loop, for each, map, and filter, with console logging and creation of new arrays.

Learn how to manipulate arrays in JavaScript using push, shift, unshift, and pop, inspect length and index values, and convert arrays to strings with toString and join, including a separator.

Discover how the map method creates a new array from an existing one, using item and index. Build full names from first and last names, and create object arrays.

Learn how to join arrays with the concat method to create a combined array, concatenate additional values, and duplicate arrays to produce separate copies not tied to the memory location.

Explore the array entries iterator in JavaScript and learn to iterate items with for and while loops, retrieving index and value via next.

Apply the array filter method to extract items by length, index, and type, and remove null or false values for clean results, including strings with uppercase first letters.

Explore how JavaScript uses '==' and '===' for comparison, demonstrating automatic type conversion with numbers, strings, arrays, and false values—null, undefined, empty string, and empty array.

Explore immediately invoked function expressions (iifes) in both function and arrow forms, pass values, see self-invoking behavior, defaults, and practical console output.

Discover how to sum numbers in an array using JavaScript with a running total, comparing for loops and while loops, and caching array length for speed.

Learn to manipulate JavaScript arrays by merging, pushing, and deleting items; explore delete versus splice, and see how concat and apply merge arrays into a single structure.

Learn how the every method checks all array elements against conditions, returning true or false, with examples on numbers, string lengths, and cross-array inclusion using includes.

Explore the array map method by creating a numbers array, applying a callback, and returning a new array with each value multiplied by itself, while logging results to the console.

Learn how to serialize and deserialize data in JavaScript using JSON.stringify and JSON.parse, including the replacer and space parameters, and converting objects and arrays to readable strings.

Learn to store complex objects in browser local storage by using JSON.stringify and JSON.parse, retrieve and update object fields via inputs and a button.

Learn to use JavaScript arrays: generate random numbers within a min and max, fill arrays in one line, select random items by index, and shuffle with sort and reverse.

Create JavaScript person object with a constructor that combines first and last names into a full name using this and new keyword, then access properties with dot or bracket notation.

Learn to trim and normalize whitespace in JavaScript strings by using regex with replace, the trim methods, and a string prototype cleaner for consistent output.

Count vowels in a string with a regex match in JavaScript, compute total length and other characters, and display results on a page via an input and button.

Create a multi-accordion interface with HTML and CSS, then control open and close behavior using JavaScript. Learn to toggle panels with class accordion, nextElementSibling, and max-height transitions.

Master JavaScript fundamentals, learn how the language works, and start coding with hands-on practice and downloadable source code to build your own applications.

Power up your web apps with pure JavaScript as this modular course covers core concepts, setup, and hands-on coding using brackets, Chrome developer tools, and CodePen for practice.

Explore the history and standardization of JavaScript, from its 1995 origins to ecmascript versions, and learn to use the browser console for interactive coding and debugging.

Learn to create a basic web page by writing JavaScript, using alert and console output, and linking a separate JavaScript file to HTML across HTML4/HTML5 practices.

Learn how JavaScript comments document code, using single-line // and multi-line /* */ syntax, while practicing variables and console.log in a developer-focused workflow.

Learn how to declare and use variables in JavaScript, assign values with the equals sign, reference them by name, and switch between numbers and strings with dynamic typing.

Explore JavaScript variables, including let, const, and var, and learn how data types like booleans, undefined, and null affect scope, conditions, and console output.

Explore variables and data types in JavaScript, declare and initialize them, and apply camel case for readable code. Learn about undefined values, console logging, boolean checks, and reserved words.

Discover how to use the JavaScript prompt to gather user input, store it in a variable, and output a personalized message to the console, with a preview of template literals.

Explore JavaScript data types, including boolean, number, string, null, undefined, and symbol, and learn how dynamic typing and explicit type conversion shape results in operations and console outputs.

Master JavaScript operators and the order of arithmetic operations, including addition, subtraction, multiplication, division, and modulus. Explore how strings, booleans, and concatenation affect results and how brackets change precedence.

Build a miles to kilometers converter in JavaScript by prompting for miles, converting the input to a number, multiplying by 1.60934, and displaying a template literal message in the console.

Explore if, else if, and else statements in JavaScript. Use truth conditions to branch code and print messages for numbers greater than 10 or equal to 10.

Explore logical operators in JavaScript to evaluate multiple conditions with and, or, and not, and practice an age prompt using the territory operator to control access.

Set a default 24-hour time and an output variable to log greetings. Use if/else thresholds—under 11 a.m., 11–17, and 17–23—for good morning, good afternoon, and good evening; switch coming next.

Explore the JavaScript switch statement, which evaluates an expression, matches cases, and executes code blocks with breaks or a default option. See how this cleaner conditional replaces long else chains.

Learn how a function processes input, runs code, and returns a computed value by multiplying two numbers, with examples of function declarations and anonymous function expressions and console output.

Learn how to execute a function from an html element using an on click attribute on buttons. Increment counters and log messages to the console as each button is clicked.

Learn a modern approach to handling DOM events by selecting all buttons with document.querySelectorAll, accessing the DOM via the document object, and wiring click event listeners to trigger separate messages.

Demonstrate how an immediately invoked function expression, or iife, runs as soon as defined, creating a self executing anonymous function with its own scope and logging results to the console.

Explore ES6 arrow functions, a concise alternative to function expressions, and learn to convert code to arrow form while maintaining cross-browser compatibility with Babel.

Learn how JavaScript objects and arrays store related values, access them with dot or bracket notation, and include methods within objects, using examples like a car and a person.

Explore the JavaScript object method and how objects and arrays interact, output object values to arrays, and create and invoke object methods like turn on and drive with console logs.

Objects and arrays use memory references, so their contents can be changed even when declared with const; however, reassigning the variable requires let.

Learn how the array filter method creates a new array of items that pass a test, using an example that selects words longer than six and numbers greater than 75.

Explores loop formats for arrays and objects in JavaScript, including for, forEach, and for...in, and demonstrates console output of array indexes with values and object properties.