JavaScript tutorials

What is the arguments object in functions?

In JavaScript, the arguments object is an array-like object accessible inside functions that contains the values of the arguments passed to that function. It provides a way to access arguments by...

JavaScript tutorials JavaScript Basics

How do you create an object in JavaScript?

This tutorial explores the various ways to create objects in JavaScript, providing detailed explanations and examples to help you choose the most appropriate method for your needs. Understanding...

JavaScript tutorials Objects and Arrays

What is the difference between forEach and map?

Both forEach and map are array methods in JavaScript used to iterate over elements. However, they serve different purposes and have distinct behaviors. Understanding these differences is crucial for...

JavaScript tutorials Objects and Arrays

What is the difference between setTimeout and setInterval?

setTimeout and setInterval are two fundamental functions in JavaScript used for asynchronous programming. They allow you to execute code after a specified delay. However, they operate differently....

JavaScript tutorials Advanced Concepts

What is the difference between dot notation and bracket notation?

In JavaScript, both dot notation and bracket notation are used to access properties of objects. Understanding their differences and when to use each is crucial for effective JavaScript development....

JavaScript tutorials Objects and Arrays

How does error handling work in JavaScript?

Error handling is a crucial aspect of writing robust and maintainable JavaScript code. It allows you to gracefully manage unexpected situations, prevent your application from crashing, and provide...

JavaScript tutorials Advanced Concepts

What are object methods in JavaScript?

In JavaScript, objects are fundamental data structures that allow you to store collections of key-value pairs. Methods are functions that are stored as properties of an object. They allow you to...

JavaScript tutorials Objects and Arrays

What is the nullish coalescing operator (??)?

The nullish coalescing operator (??) is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side...

JavaScript tutorials JavaScript Basics

What is the difference between class and prototype inheritance?

This tutorial clarifies the distinctions between class-based and prototype-based inheritance in JavaScript, providing examples and practical insights.

JavaScript tutorials Object-Oriented JavaScript

How do you declare a variable in JavaScript?

Learn how to declare variables in JavaScript using var, let, and const. Understand the differences and best practices for each keyword.

JavaScript tutorials JavaScript Basics

How do you handle events in JavaScript?

This tutorial explores how to handle events in JavaScript, covering various methods and best practices for creating interactive web applications. It delves into the concepts of event listeners, event...

JavaScript tutorials Web APIs and the DOM

What is the typeof operator used for?

The typeof operator in JavaScript is a fundamental tool for determining the data type of a variable. It's a unary operator, meaning it operates on a single operand (the variable you want to check)....

JavaScript tutorials JavaScript Basics

What is the difference between var, let, and const?

In JavaScript, var, let, and const are keywords used to declare variables. While they serve a similar purpose, there are significant differences in their scope, hoisting, and...

JavaScript tutorials JavaScript Basics

How do you sort an Array in JavaScript?

Sorting arrays is a common task in JavaScript development. The sort() method allows you to arrange array elements in ascending or descending order. By default, the sort() method sorts elements...

JavaScript tutorials Objects and Arrays

What is the difference between == and ===?

In JavaScript, == and === are comparison operators, but they behave differently. Understanding this difference is crucial for writing correct and predictable JavaScript code. == performs type coercion...

JavaScript tutorials JavaScript Basics

What is a callback function in JavaScript?

In JavaScript, a callback function is a function passed as an argument to another function, and is executed after the other function has finished its execution. It's a fundamental concept in...

JavaScript tutorials JavaScript Basics

What are getters and setters in JavaScript objects?

Getters and setters are special methods within JavaScript objects that allow you to control how object properties are accessed and modified. They provide a way to encapsulate the logic behind getting...

JavaScript tutorials Objects and Arrays

What is the DOM in JavaScript?

The Document Object Model (DOM) is a fundamental concept in web development. It acts as a structured representation of an HTML or XML document, allowing JavaScript to interact with and manipulate the...

JavaScript tutorials Web APIs and the DOM

How do you modify the DOM with JavaScript?

This tutorial explains how to modify the Document Object Model (DOM) using JavaScript, covering common methods for creating, updating, and removing elements and attributes.

JavaScript tutorials Web APIs and the DOM

How do break and continue work in loops?

In JavaScript, break and continue are control flow statements used within loops (for, while, do...while). They provide ways to alter the normal execution flow of the loop, allowing you to skip...

JavaScript tutorials JavaScript Basics

How do you convert a string to a number in JavaScript?

In JavaScript, converting a string to a number is a common task. Several methods are available, each with its own nuances and use cases. Understanding these methods is crucial for writing robust and...

JavaScript tutorials JavaScript Basics

How do you inherit properties in JavaScript?

Inheritance in JavaScript is a powerful mechanism that allows you to create new objects based on existing ones, inheriting their properties and methods. This promotes code reusability and helps...

JavaScript tutorials Object-Oriented JavaScript

What are microtasks and macrotasks in JavaScript?

Understanding microtasks and macrotasks is crucial for writing efficient and predictable asynchronous JavaScript code. They are the building blocks of the event loop, which manages the execution of...

JavaScript tutorials Advanced Concepts

How do you use localStorage in JavaScript?

localStorage is a web API that allows you to store key-value pairs in the user's browser. This data persists even after the browser is closed and reopened, making it ideal for storing user...

JavaScript tutorials Web APIs and the DOM

What is scope in JavaScript?

In JavaScript, scope determines the accessibility (visibility) of variables. In other words, scope defines where in your code you can access a particular variable. Understanding scope is crucial for...

JavaScript tutorials Advanced Concepts

What are default parameters in JavaScript functions?

Default parameters in JavaScript functions provide a way to set default values for function parameters if no value (or undefined) is passed when the function is called. This enhances code readability,...

JavaScript tutorials JavaScript Basics

How do you clone an object in JavaScript?

Cloning an object in JavaScript means creating a new object with the same properties and values as the original object. However, it's crucial to understand the difference between shallow and deep...

JavaScript tutorials Objects and Arrays

What is array destructuring in JavaScript?

Array destructuring is a powerful JavaScript feature that allows you to unpack values from arrays (or properties from objects) into distinct variables. It's a concise and readable way to extract data...

JavaScript tutorials Objects and Arrays

What are common array methods (map, filter, reduce)?

This tutorial explores the powerful and commonly used array methods in JavaScript: map, filter, and reduce. These methods allow you to manipulate arrays in a concise and expressive way, without...

JavaScript tutorials Objects and Arrays

How do for loops work in JavaScript?

The for loop is a fundamental control structure in JavaScript used for executing a block of code repeatedly until a specified condition is met. It provides a concise way to iterate over a sequence of...

JavaScript tutorials JavaScript Basics