JavaScript Daily Quiz

JavaScript Quiz Questions

1. What is the output of the following code?

JavaScript

var x = 1;

var y = 2;

console.log(x + y);

Code snippet

Output: 3

2. What is the output of the following code?

JavaScript

var x = “Hello”;

var y = “World”;

console.log(x + y);

Code snippet

Output: HelloWorld

3. What is the output of the following code?

JavaScript

var x = 1;

var y = 2;

if (x > y) {

  console.log(“x is greater than y”);

} else {

  console.log(“y is greater than x”);

}

Code snippet

Output: y is greater than x

4. What is the output of the following code?

JavaScript

var x = 1;

var y = 2;

while (x < y) {

  x++;

}

console.log(x);

Code snippet

Output: 3

5. What is the output of the following code?

JavaScript

var x = [1, 2, 3];

for (var i = 0; i < x.length; i++) {

  console.log(x[i]);

}

Code snippet

Output: 1

2

3

6. What is the output of the following code?

JavaScript

var x = “Hello”;

for (var i = 0; i < x.length; i++) {

  console.log(x[i]);

}

Code snippet

Output: H

e

l

l

o

7. What is the output of the following code?

JavaScript

var x = {

  name: “John Doe”,

  age: 30

};

console.log(x.name);

console.log(x.age);

Code snippet

Output: John Doe

30

8. What is the output of the following code?

JavaScript

var x = {

  name: “John Doe”,

  age: 30

};

x.name = “Jane Doe”;

console.log(x.name);

Code snippet

Output: Jane Doe

9. What is the output of the following code?

JavaScript

var x = {

  name: “John Doe”,

  age: 30

};

x.age = 31;

console.log(x.age);

Code snippet

Output: 31

10. What is the output of the following code?

JavaScript

var x = {

  name: “John Doe”,

  age: 30

};

x.sayHello = function() {

  console.log(“Hello, my name is ” + this.name);

};

x.sayHello();

Code snippet

Output: Hello, my name is John Doe