JavaScript Basics Overview

Strings, numbers, booleans, null, undefined, objects, and symbols.

Using the var, let, or const keywords.

A high-level, interpreted programming language primarily used for creating interactive web pages.

<p><code>var</code> has function scope, <code>let</code> has block scope, and <code>const</code> is used for constants.</p> Signup and view all the answers

<p><code>==</code> is used for loose equality comparison, whereas <code>===</code> is for strict equality comparison.</p> Signup and view all the answers

<p>Single-line comments are denoted by <code>//</code>, and multi-line comments are enclosed by <code>/*</code> and <code>*/</code>.</p> Signup and view all the answers

<p>Strings, numbers, booleans, null, undefined, and symbols.</p> Signup and view all the answers

<p>To determine the type of a variable or an expression.</p> Signup and view all the answers

<p>Hoisting is the default behavior of moving variable and function declarations to the top of their containing scope.</p> Signup and view all the answers

<p><code>NaN</code> stands for Not-a-Number and is a value returned when a mathematical operation cannot produce a meaningful result.</p> Signup and view all the answers

<p>Closures are functions that have access to their outer function's scope after the outer function has finished executing.</p> Signup and view all the answers

<p>Functions that operate on other functions, either by taking them as arguments or by returning them.</p> Signup and view all the answers

<p>A function passed as an argument to another function, which is invoked inside the outer function.</p> Signup and view all the answers

<p>A technique where a single event listener is attached to a parent element to listen for events on its children.</p> Signup and view all the answers

<p>The mechanism by which objects in JavaScript inherit properties and methods from other objects, known as prototypes.</p> Signup and view all the answers

<p>Refers to the object on which a method is being invoked or the context in which a function is called.</p> Signup and view all the answers

<p>Using mechanisms such as callbacks, promises, and async/await.</p> Signup and view all the answers

<p>Objects representing the eventual completion or failure of an asynchronous operation.</p> Signup and view all the answers

<p><code>null</code> represents the intentional absence of any object value, while <code>undefined</code> indicates a declared variable with no assigned value.</p> Signup and view all the answers

<p>A mechanism that handles asynchronous operations, ensuring they are executed in a non-blocking manner.</p> Signup and view all the answers

<p><code>null</code> is an explicitly assigned absence of value, <code>undefined</code> is for declared but uninitialized variables, and <code>undeclared</code> means the variable has not been declared.</p> Signup and view all the answers

<p>A paradigm where the flow of the program is determined by events like user actions or network requests.</p> Signup and view all the answers

<p>Synchronous JavaScript executes code sequentially, while asynchronous JavaScript allows operations to run concurrently, without blocking.</p> Signup and view all the answers