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JavaScript Basic Programs for Beginners

JavaScript Basic Programs for Beginners - Important Points

16.

What is the output of the following code snippet?

console.log("hello".length);

A. hello

B. 5

C. null

D. undefined

Discuss Work Space

Answer: option b

Explanation:

The output of the code is "5" because the length property returns the number of characters in a string.
17. Which of the following is the correct way to add an element to the end of an array in JavaScript?

A. myArray.push(newElement);

B. myArray.add(newElement);

C. myArray.insert(newElement, myArray.length);

D. myArray[myArray.length] = newElement;

Discuss Work Space

Answer: option a

Explanation:

The correct way to add an element to the end of an array in JavaScript is by using the push() method: "myArray.push(newElement);".
18.

What is the output of the following code snippet?

console.log(2 * "3");

A. 5

B. 6

C. 9

D. 23

Discuss Work Space

Answer: option b

Explanation:

The output of the code is "6" because the string "3" is converted to a number when used in a mathematical operation.
19. Which of the following is the correct way to remove an element from the end of an array in JavaScript?

A. myArray.removeLast();

B. myArray.pop();

C. myArray.delete(myArray.length);

D. myArray[myArray.length] = null;

Discuss Work Space

Answer: option b

Explanation:

The correct way to remove an element from the end of an array in JavaScript is by using the pop() method: "myArray.pop();".
20.

What is the output of the following code snippet?

console.log(typeof undefinedVariable);

A. number

B. string

C. boolean

D. undefined

Discuss Work Space

Answer: option d

Explanation:

The output of the code is "undefined" because undefined
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