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Functions (normal, arrow, anonymous, scope) Interview Questions

MCQ Question 1 of 10

Question 1: Normal Function Declaration

Which of the following correctly declares a normal function in JavaScript?

function myFunc { console.log("Hello"); }

function myFunc() { console.log("Hello"); }

myFunc() = function { console.log("Hello"); }

func myFunc() { console.log("Hello"); }

Question 2: Arrow Function Syntax

Which is the correct syntax of an arrow function that returns the sum of a and b?

let sum = (a, b) => a + b;

let sum = (a, b) -> a + b;

let sum(a, b) => a + b;

let sum = (a, b) { return a + b; }

Question 3: Anonymous Functions

An anonymous function is a function that:

Has no parameters

Has no return value

Has no name

Cannot be assigned to a variable

Question 4: Function Hoisting

Which type of function gets hoisted completely in JavaScript?

Arrow functions

Anonymous functions

Function declarations

Function expressions

Question 5: Function Expression Example

Which of the following is a valid function expression?

function add(a, b) { return a + b; }

let add = function(a, b) { return a + b; };

let add(a, b) => { return a + b; };

func add = (a, b) { return a + b; };

Question 6: Scope of Variables

Which variable has function scope in JavaScript?

let

const

var

global

Question 7: Arrow Function this Behavior

What is special about this in arrow functions?

It refers to the object calling the function

It refers to the global object always

It uses lexical scope of this (from parent)

It creates a new this

Question 8: IIFE (Immediately Invoked Function Expression)

Which syntax correctly represents an IIFE?

function() { console.log("Run"); }();

(function() { console.log("Run"); })();

() => { console.log("Run"); }();

func() { console.log("Run"); }();

Question 9: JS Default Parameters

What will greet("Alice") print if the function is defined as:

function greet(name = "Guest") { console.log(name); }

Guest

Alice

undefined

Error

Question 10: Hoisting with Function Expressions

What happens if you call a function expression before it is defined?

greet();
var greet = function() { console.log("Hello"); };

It prints "Hello"

It throws an error

It prints undefined

It prints nothing