JavaScript Basics

JavaScript Basics - Important Points

26.		Which of the following is a valid way to declare a variable in JavaScript?

A. variable name = value;

B. var name = value;

C. let name = value;

D. all of the above

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Answer: option c

Explanation:

All of the options are syntactically valid, but the recommended way to declare a variable in modern JavaScript is using the let keyword.

27.		What is the output of the following code? console.log(3 === "3");

27.

What is the output of the following code?

console.log(3 === "3");

A. 1

B. 0

C. NaN

D. null

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Answer: option b

Explanation:

The === operator in JavaScript tests for strict equality. The string "3" is not strictly equal to the number 3, so the expression evaluates to false.

28.		What is the output of the following code? console.log("2" * "3");

28.

What is the output of the following code?

console.log("2" * "3");

A. 5

B. 6

C. 23

D. 6

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Answer: option b

Explanation:

The * operator in JavaScript performs multiplication. When used with strings, JavaScript tries to convert them to numbers before performing the operation.

29.		Which of the following is a valid way to create a function in JavaScript?

A. function myFunction() {}

B. var myFunction = function() {};

C. const myFunction = () => {};

D. all of the above

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Answer: option d

Explanation:

All of the options are valid ways to create a function in JavaScript.

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

30.

What is the output of the following code?

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

A. HELLO

B. hello

C. undefined

D. null

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Answer: option a

Explanation:

The toUpperCase() method in JavaScript converts a string to all uppercase letters.

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