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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 parametersHas no return valueHas no nameCannot be assigned to a variable

Question 4: Function Hoisting

Which type of function gets hoisted completely in JavaScript?

Arrow functionsAnonymous functionsFunction declarationsFunction 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?

letconstvarglobal

Question 7: Arrow Function this Behavior

What is special about this in arrow functions?

It refers to the object calling the functionIt refers to the global object alwaysIt 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); }

GuestAliceundefinedError

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 errorIt prints undefinedIt prints nothing