In the early days of web development, there was another language called "LiveScript" that was developed almost simultaneously with JavaScript. Although they had similar names, they were different languages. Eventually, LiveScript was renamed to JavaScript.

The mechanism that allows you to use the structure of a class and alter it for use in another class is known as "Inheritance." Inheritance in JavaScript is achieved through the prototype chain, where a child class can inherit properties and methods from a parent class, allowing for code reuse and extension.

The keyword "new" in JavaScript is used to instantiate an object from a class constructor. When you use "new" followed by a class constructor, it creates a new instance of that class, allowing you to work with objects that have the properties and methods defined in the class. It doesn't create a class, declare a variable, or define a function.

An async function can contain an await expression that pauses the execution of the async function and waits for the passed Promise to resolve or reject. This allows for more readable and sequential asynchronous code, making it easier to work with asynchronous operations.

Instead of var, they should use let to maintain block scope. var has function scope and can lead to unexpected behavior in certain situations, while let declares a variable with block scope, ensuring that it's limited to the block in which it's defined.

Adding the async keyword before a function declaration in JavaScript signifies that the function is asynchronous. This means it can use the await keyword inside to pause execution until asynchronous operations within the function are complete, improving code readability and maintainability.

The ECMAScript initiative aimed to standardize the core features of JavaScript. ECMAScript defines the language specification that JavaScript implementations, such as those in web browsers, must adhere to. It ensures consistency and compatibility across different environments.

While JavaScript and JSON share a similar name, JSON (JavaScript Object Notation) is a data interchange format and not a technology directly influenced by JavaScript's development. Java, Node.js, and jQuery, on the other hand, are technologies that were influenced or built upon JavaScript.

In JavaScript, you can declare a block-scoped variable using the let keyword. Variables declared with let are limited in scope to the block, statement, or expression in which they are defined. This helps prevent unintended variable hoisting and allows you to create variables with localized scope within functions or blocks. var is function-scoped, and const is used to declare constants. block is not a valid keyword for variable declaration.

The querySelector method uses CSS selectors to select elements in the DOM. You can use CSS selector syntax to specify the elements you want to select, making it a powerful tool for finding and manipulating DOM elements based on their attributes and structure.