JavaScript Arrays and Objects Basic Data Structures

Explore JavaScript arrays with practical coding examples that demonstrate common array methods to manipulate array data, view results in the browser console, and follow a downloadable pdf guide.

Discover how to clean an array by removing duplicates and false values, undefined, null, and zero using a set and boolean filter for a clean, unique result.

Explore how to loop through arrays using for, while, and for each, then create new arrays with map and filter while logging results to the console.

Explore how to update arrays in JavaScript by using push, shift, pop, and unshift to add or remove items, and convert arrays to strings with toString and join.

Use the map method to create a brand new array from an existing one, using item and index in the callback, and build full names from first and last names.

Learn how to concatenate arrays, duplicate an array to avoid shared memory, and see how assigning arrays affects memory location and linked updates.

Explore the array entries iterator to loop through items and retrieve index and value. Use next, for loops, and while loops to output each item to the console.

Explore the array filter method in JavaScript by applying multiple filters: length checks, index-based selection, type checks, and cleanup with boolean values to produce a clean, new array.

Explore how JavaScript array methods like includes, indexOf, lastIndexOf, and findIndex locate values and return indices or booleans, with practical examples and behavior when items are not found.