JavaScript Basic Programs for Beginners

JavaScript Basic Programs for Beginners - Important Points

21.		What is the output of the following code snippet? console.log("hello".toUpperCase());

21.

What is the output of the following code snippet?

console.log("hello".toUpperCase());

A. hello

B. HELLO

C. null

D. undefined

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Answer: option b

Explanation:

The output of the code is "HELLO" because the toUpperCase() method converts a string to uppercase.

22.		Which of the following is the correct way to concatenate two strings in JavaScript?

A. string1.concat(string2);

B. string1 + string2;

C. string1.join(string2);

D. string1.append(string2);

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Answer: option b

Explanation:

The correct way to concatenate two strings in JavaScript is by using the "+" operator: "string1 + string2;".

23.		What is the output of the following code snippet? console.log(2 + "3");

23.

What is the output of the following code snippet?

console.log(2 + "3");

A. 23

B. 5

C. null

D. undefined

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Answer: option a

Explanation:

The output of the code is "23" because the number 2 is converted to a string when concatenated with the string "3".

24.		Which of the following is the correct way to check if a variable is an array in JavaScript?

A. if (typeof myArray === "array") {}

B. if (myArray.isArray()) {}

C. if (myArray === "Array") {}

D. if (Array.isPrototypeOf(myArray)) {}

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Answer: option b

Explanation:

The correct way to check if a variable is an array in JavaScript is by using the isArray() method: "if (myArray.isArray()) {}".

25.		What is the output of the following code snippet? console.log(Math.random() * 10);

25.

What is the output of the following code snippet?

console.log(Math.random() * 10);

A. a random number between 1 and 10

B. a random number between 0 and 10

C. 10

D. null

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Answer: option b

Explanation:

The output of the code is a random number between 0 and 10 because the Math.random() method generates a random number between 0 and 1.

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