JavaScript For Beginners

Discover how hoisting moves declarations to the top of the current scope, making var undefined until initialization while let is hoisted but not initialized.

Understand JavaScript identifiers: allowed characters include letters, digits, underscores, and dollar signs; start with a letter, dollar, or underscore; identifiers are case sensitive and reserved words are not allowed.

Learn how to enable strict mode in JavaScript with use strict, understand its benefits for beginners and experienced programmers, and avoid undeclared variables and duplicate parameters.

Explains the javascript if statement, where a true condition triggers an action and a false condition triggers an alternative. Covers braces usage, multiple statements, and else if chains improve programs.

Explore while and for loops in JavaScript, see a for loop printing numbers 1 to 10 and their squares with a template string, and learn block-scoped let usage.

Master the while loop by starting at one, using a condition to print numbers and their squares with a template string, and incrementing to avoid infinite loops.

Use a loop to build a multiplication table from a user-entered number, up to ten rows, three columns (number, multiplier, result), triggered by a table button.

Practice string manipulation in JavaScript by extracting the server from an email address and validating its format, then parse comma-separated marks to compute a total.

Explore JavaScript array methods, including push, splice, indexOf, and in-place sort, and learn how string sorting follows dictionary order with case sensitivity and ASCII values.

Compute a student's total marks from a comma-separated input using a simple HTML and JavaScript setup. Convert inputs to numbers, ignore non-numbers with isNaN, and log for debugging.

Learn how sets store unique values and ignore duplicates, use add, delete, and has to manage elements, and iterate with forEach or access values for processing.

Master regular expressions to construct patterns, validate input, and extract matches using test and exec, with digits, anchors, and meta characters for practical validation tasks.

Build a simple HTML page to enter, store, and display names. Learn to add and delete names using JavaScript array methods like push, indexOf, and splice, with proper not-found handling.

Create an anonymous function and store it in a variable, then invoke it via that variable, a function expression.

Explore how default parameters make arguments optional by assigning default values, such as B has a default value of one. Call a function with fewer arguments to see defaults apply.

Learn how arrow functions provide a compact, shorthand alternative to regular functions, supporting a single expression or multiple statements, with shared parameters and no own this reference.

Learn how to use the array find method in JavaScript to locate the first element that satisfies a predicate, with an optional index, and compare it to filter.

Learn how to use the array forEach method to process every element with a callback function, print results, or perform actions like squaring numbers, while contrasting map, filter, and find.

Learn how a nested function becomes a closure by returning from an outer function, preserving the outer function's arguments and variables for later calls.

Create and modify object literals in JavaScript without classes, access properties like name and job, and add or update fields such as salary or skills (an array).

Explain that fields are public by default and become private with a hash prefix. Demonstrate that private fields cannot be accessed from outside class, and accessing them triggers an error.

Explore the history object in the browser object model, using history.back and history.forward to navigate back and forth with page buttons.