Quiz – 2 (JavaScript) Ethereum-B3

Which of the following is a correct way to write an if statement in JavaScript?

What will the following code output?
if (true) { console.log(“Hello”); } else { console.log(“Goodbye”); }

What is the output of the following code?
let x = 5;
if (x > 3) { x += 2; } else { x -= 2; }
console.log(x);

How many times will the following loop run?
for (let i = 0; i < 5; i++) { console.log(i); }

What is the purpose of the continue statement in a loop?

What will the following code output?
let x = 1;
do { console.log(x); x++; } while (x < 4);

Which loop would be best to use when the number of iterations is known before the loop starts?

What is the difference between while and do-while loops?

Which method adds one or more elements to the end of an array and returns the new length of the array?

What will the following code output?
let fruits = [“Apple”, “Banana”];
fruits.push(“Mango”); console.log(fruits);

Which method removes the last element from an array and returns that element?

What is the result of the following code?
let numbers = [1, 2, 3]; let removed = numbers.pop(); console.log(removed);

Which method adds one or more elements to the beginning of an array and returns the new length of the array?

What does the shift() method do?

What is the output of the following code?
let stack = [];
stack.push(1); stack.push(2); stack.pop(); console.log(stack);

What is the output of the following code?
let queue = [];
queue.push(1); queue.push(2); queue.shift(); console.log(queue);

Which of the following methods would you use to reverse the order of elements in an array?

Which method creates a new array with all elements that pass the test implemented by the provided function?

What is the correct way of function declaration in JavaScript?

What is the result of the following code?
function add(a, b) { return a + b; }
console.log(add(2, 3));

What is an anonymous function in JavaScript?

What will the following code output?
let sum = function(a, b) { return a + b; };
console.log(sum(1, 2));

What is an arrow function in JavaScript?

What will the following code output?
let multiply = (a, b) => a * b; console.log(multiply(2, 3));

How can you define a function that takes another function as an argument?

What is the output of the following code?
function outerFunc() {
function innerFunc() { return 2; }
return innerFunc();
}
console.log(outerFunc());

What will the following code output?
function add(a, b = 5) {
return a + b;
}
console.log(add(3));

How can you create an immediately invoked function expression (IIFE)?

Which of the following creates a new date object representing the current date and time?

What is the output of the following code?
let date = new Date(“2023-01-01”);
console.log(date.getFullYear());

Which method returns the number of milliseconds since January 1, 1970?

What will the following code output?
let date = new Date(); console.log(date.getMonth());

Which method sets the day of the month for a specified date?

What is the output of the following code?
let date = new Date(); date.setFullYear(2025); console.log(date.getFullYear());

Which method returns the day of the week for the specified date?

What will the following code output?
let date = new Date(“2023-12-31”); console.log(date.getDate());

What is the purpose of a conditional statement in JavaScript?

Which keyword is used to create an if-else statement?

What is the output of an if statement if the condition is false and there is no else clause?

Which of the following is NOT a loop structure in JavaScript?