To prevent script injection attacks, it's crucial to use the textContent property to set content dynamically. Unlike innerHTML, which parses and executes scripts, textContent treats input as plain text, reducing the risk of script injection. Using libraries may help but doesn't guarantee security. innerText has limited browser support.

You can utilize closures in JavaScript to maintain state between function calls without relying on global variables. A closure is a function that has access to variables from its outer (enclosing) function's scope, even after the outer function has finished executing. This allows you to create private variables and maintain state within the closure function.

The switch statement in JavaScript uses strict (===) comparison to evaluate cases. This means that not only the value but also the data type must match for a case to be executed. This ensures accuracy when comparing values in a switch statement.

When using the new keyword to create an object, you must use a Constructor Function. Constructor functions are used to create and initialize objects. They are invoked with the new keyword and often set object properties and methods within the constructor. Arrow functions are not suitable because they don't have their own this context.

To add a new property to an existing object in JavaScript, you would typically use the Object.assign() method. This method allows you to merge properties from one or more source objects into a target object. It can be used to add or update properties in the target object.

The this keyword inside a constructor function refers to the current instance of the object being created. It allows you to access and assign properties and methods to the instance being constructed, making it unique for each object created with the constructor. It does not refer to the global or parent object.

When an event listener is invoked, it receives an event object containing information about the event. It also has access to the target (the element that triggered the event) and type (the type of event). However, timestamp is not an argument passed to an event listener. It can be obtained using event.timeStamp.

An Async function returns a promise implicitly. When you declare a function as async, it means the function will always return a promise, allowing you to use await inside it to handle asynchronous operations more cleanly.

The correct method to parse a JSON string into a JavaScript object is JSON.parse(). It takes a JSON string as input and returns a JavaScript object. The other options (toJSON(), parseJSON(), stringToJSON()) are not valid JSON parsing methods.

The primary use of the switch statement in JavaScript is to perform conditional branching. It allows you to execute different code blocks based on the value of an expression, making it a powerful tool for decision-making in your code.