Infosys Certified JavaScript Professional

As per the below JavaScript code snippet, predict the output. 

let student = { name: "John", rank: "3", course: null } 
let { rank, course} = student; 
if (rank !== 3) { 
	if (typeof(course) === null) { 
		console.log("HTML"); 
	} 
	else if (typeof course !== "object") {
		console.log("CSS"); 
	} 
	else { 
		console.log("JavaScript"); 
	} 
} 
else { 
	console.log("Bootstrap"); 
}

A developer implemented the below function that determines if a given number is positive, negative, or zero. Consider the following code which relies on the ternary operator:

function determineSign(num){ 
	return (num>0)?"Positive":(num<0)?"Negative":"Zero"; 
} 
console.log(determineSign(-5)+" and "+determineSign(0)+" and "+determineSign(10)) 

What will be the output of the above code snippet?

What will be the console output, when the below JavaScript code is executed? 

let myMessage="Hello World!"; 
let myMessage="Hello JavaScript!"; 
console.log(myMessage)

A developer is creating a JavaScript function to manage a library system. The function needs to declare variables for the book title, author name, and the number of copies available. Which line of code will cause an error?

function manageLibrary() { //Line 1 
	let bookTitle = "JavaScript Essentials"; //Line 2 
	let authorName = "John Doe"; //Line 3 
	let numberOfCopies = 5; //Line 4 
	let book-title = bookTitle + " by " + authorName; //Line 5 
	let totalCopies = numberOfCopies * 2; //Line 6 
	return book-title + " has " + totalCopies + " copies available."; //Line 7 
}

Consider the following JavaScript code snippet. What will be the output of the console.log statements? 

let user = { 
	name: "Alice", 
	age: 30, 
	isPremiumMember: true, 
	getDetails: function() { 
		return `${this.name} is ${this.age} years old and ${this.isPremiumMember ? "is" : "is not"} a premium member.`; 
	} 
}; 
console.log(typeof user.age); 
console.log(user.getDetails()); 
console.log(typeof user.getDetails);

Predict the output of the following code: 

let result = 1; 
for (let i = 2; i <=3; i++) { 
	for (let j = 2; j <= 3; j++) { 
		if (i === 2 && j === 3) { 
			continue; 
		} 
		result += i + j; 
	} 
} 
console.log(result);

Consider the following JavaScript for loop: 

for (var i=0; i< 5; i++) { 
	setTimeout(() => console.log(i), 1000); 
}

What will be the output after 1 second?

What will be the output of the following code? 

let a=10; 
if(a = 6) { 
	console.log("Executed"); 
} 
else {
	console.log("Not Executed"); 
}

What will be the output of the following code? 

function scope() { 
	var x = 1; let y = 10; 
	const z = 20; 
	console.log("Initial values:", x, y, z); 
	if (true) { 
		var x = 2; 
		let y = 15; 
		const z = 25; 
		console.log("Inside if block:", x, y, z); 
	} 
	console.log("After if block:", x, y, z); 
} 
scope();