Modern JavaScript Mastery: A Complete Guide

Learn to measure code performance with console.time and console.timeEnd, explore the Chrome console and document interactions, including document.getElementById and innerText in the DOM.

Explore JavaScript logical operators, including and, or, and not, and their symbols (&&, ||, !). See how two conditions in an if statement yield true or false outcomes.

Learn to use the JavaScript prompt box to collect user input, assign it to a variable, and log results in the console; apply it with if-else to categorize a percentage.

Explain global versus local variables in JavaScript through practical examples, showing how a global variable is accessible inside and outside a function, while a local variable remains confined.

Learn how to implement a JavaScript do while loop, including initialization, the post-check condition, and increment, and compare it with a while loop while printing hello world.

Master JavaScript break and continue statements for controlling loops, printing numbers, and replacing specific iterations with hello inside a for loop using if conditions.

Learn to declare and use JavaScript arrays, access zero-based elements by index, loop with a for loop, and display results in the browser.

Explore multidimensional arrays in JavaScript by turning related student data into outer and inner arrays, then access and print specific fields by index.

Learn to use multidimensional arrays with nested loops in JavaScript, implementing outer and inner loops to print arrays and format output for clean, comma-free results.

Learn how to use JavaScript array pop and push methods to remove the last element and append new values to an array, with practical examples and live coding.

Learn to use indexOf and lastIndexOf in JavaScript to find values in an array, returning the first or last index, with an optional start index and -1 when not found.

Discover how to apply the JavaScript array filter method to extract values meeting a condition, returning a new array of ages greater than 18.

Learn how to use the for-in loop in JavaScript to iterate over object properties, print keys and values, and access each property with a loop variable.

Explore the JavaScript map method for arrays, returning a new array without mutating the original, multiplying values by ten and extracting first or last names from objects.

Explore essential JavaScript string methods, including length, toLowerCase, toUpperCase, includes, startsWith, endsWith, search, and match with regular expressions, to perform effective string manipulation.

Learn how to update DOM values with five methods, including changing innerHTML, setting and removing attributes, and reading attributes via getAttribute, using getElementById to target elements.

Learn to use addEventListener with inner and outer divs, understand the useCapture parameter for click event propagation, and apply removeEventListener to manage events.

Master JavaScript form events by implementing onchange for inputs and selects, handling onselect, onsubmit, and oninvalid with custom alerts and validation messages.

Discover how to access window inner height and width, and outer height and width, distinguishing viewport from browser size, and update them in real time with a resize event.

Learn to open and close browser windows with JavaScript using window.open and window.close. Explore parameters like URL, name, and width, height, left, and top.