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JavaScript Basic Programs for Beginners

JavaScript Basic Programs for Beginners - Important Points

1.

What is the correct syntax for declaring a JavaScript variable?

A. var x;

B. x = var;

C. variable x;

D. x = variable;

Discuss Work Space

Answer: option a

Explanation:

The correct syntax for declaring a JavaScript variable is "var variableName;"

2.

What is the output of the following program?

 console.log(3 + 4 + "5");

A. 12

B. 75

C. 345

D. 7+5

Discuss Work Space

Answer: option b

Explanation:

The output of the code is "75" because the first two numbers are added (3 + 4 = 7) and then the result is concatenated with the string "5".
3. Which of the following is NOT a valid way to comment in JavaScript?

A. // This is a comment

B. /* This is a comment /

C.

D. # This is a comment

Discuss Work Space

Answer: option d

Explanation:

The correct way to comment in JavaScript is by using "//" for single-line comments or "/ */" for multi-line comments.
4.

What is the output of the following program?

console.log(typeof "hello");

A. number

B. string

C. boolean

D. undefined

Discuss Work Space

Answer: option b

Explanation:

The output of the code is "string" because "hello" is a string.
5. Which of the following is the correct way to create a function in JavaScript?

A. function myFunction() {}

B. var myFunction = function() {};

C. myFunction = function() {};

D. All of the above are correct.

Discuss Work Space

Answer: option d

Explanation:

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