JavaScript Basic Programs for Beginners

JavaScript Basic Programs for Beginners - Important Points

11.		Which of the following is the correct way to create an array in JavaScript?

A. var myArray = ();

B. var myArray = [];

C. myArray = array();

D. myArray = {};

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Answer: option b

Explanation:

The correct way to create an array in JavaScript is by using the syntax "var myArray = [];".

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

12.

What is the output of the following code snippet?

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

A. 1

B. 0

C. null

D. undefined

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Answer: option b

Explanation:

The output of the code is "false" because 3 is a number and "3" is a string, so they are not equal when using the strict equality operator (===).

13.		Which of the following is the correct way to access an element in an array in JavaScript?

A. myArray[elementIndex]

B. elementIndex.myArray

C. myArray[elementValue]

D. myArray[elementIndex][elementValue]

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Answer: option a

Explanation:

The correct way to access an element in an array in JavaScript is by using the syntax "myArray[elementIndex]".

14.		What is the output of the following code snippet? console.log(5 > 2 && 2 < 4);

14.

What is the output of the following code snippet?

console.log(5 > 2 && 2 < 4);

A. 1

B. 0

C. null

D. undefined

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Answer: option a

Explanation:

The output of the code is "true" because both conditions are true when using the logical AND operator (&&).

15.		Which of the following is the correct way to write a for loop in JavaScript?

A. for (var i = 0; i < array.length; i++) {}

B. for (i = 0; i < array.length; i++) {}

C. for (var i = 0; i < array.length; i--) {}

D. for (i = 0; i < array.length; i = i + 2) {}

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Answer: option a

Explanation:

The correct way to write a for loop in JavaScript is by using the syntax "for (var i = 0; i < array.length; i++) {}".

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