Javascript Function Quiz

What is abstraction in the context of JavaScript functions?

• It is a process of hiding the implementation details and showing only the functionality
• It is a process of creating new data types
• It is a process of converting one data type to another
• It is a process of creating multiple copies of a function

When you invoke a function, which of the following is true about generalization?

• Generalization is the process of invoking a function
• Generalization is the process of making something more general
• Generalization is the process of defining a function
• The function can accept multiple arguments and provide more generalized functionality.s

What does a JavaScript function typically return if there is no explicit return statement?

• undefined

• null

• The value of the last executed statement inside the function.

• An error.

What is hoisting with respect to JavaScript functions?

• Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their containing scope before code execution.
• Hoisting is a JavaScript mechanism for changing the scope of a variable.
• Hoisting is a JavaScript mechanism for declaring variables only.
• Hoisting is a JavaScript mechanism for executing functions before they are declared.

Which of the following is an example of a function expression?

• function myFunction() {}
• myFunction() {}
• const myFunction = function() {}

• myFunction: function() {}

What is an anonymous function in JavaScript?

• A function with no name
• A function that is not declared
• A function that returns null
• A function that cannot be called

What does an Immediately Invoked Function Expression (IIFE) do?

• It allows to run a function as soon as it is defined
• It allows to delay the execution of a function
• It allows to repeat the execution of a function
• It allows to stop the execution of a function

In JavaScript, what is the scope of a variable declared inside a function (function-level scope)?

• Global scope
• Block scope
• Function-level scope
• None of the above

What is the scope chain in JavaScript?

• The scope chain in JavaScript is a hierarchy of variable scopes, where each scope is a object that provides a set of variables.
• A chain of methods in JavaScript.
• A chain of classes in JavaScript.
• A chain of functions in JavaScript.

What is a closure in JavaScript?

• A closure is a function that has access to its own scope, the outer function’s scope, and the global scope.
• A closure is a special kind of object that combines two functions.
• A closure is a type of variable in JavaScript.
• A closure is a JavaScript keyword used to close a function.