Q
How do you concatenate strings in JavaScript?

Answer & Solution

Answer: Option A
Solution:
In JavaScript, you can concatenate strings using the + operator. When you use the + operator between two strings, they are concatenated to form a new string. For example, 'Hello' + 'World' will result in 'HelloWorld'. Therefore, option A is correct for concatenating strings in JavaScript.
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A). // This is a comment

B). <!-- This is a comment -->

C). /* This is a comment */

D). ''' This is a comment '''

What is the purpose of the 'this' keyword in JavaScript?

A). To refer to the current HTML element

B). To refer to the current JavaScript file

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D). To refer to the current function

What is the purpose of the 'break' statement in a JavaScript switch case?

A). To continue to the next case

B). To exit the switch statement

C). To restart the switch statement

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What is the purpose of the 'return' statement in a JavaScript function?

A). To end the function execution

B). To return a value from the function

C). To print a value to the console

D). To declare a variable

What is the purpose of the 'constructor' method in a JavaScript class?

A). To create new instances of the class

B). To initialize class properties

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What does the '===' operator check in JavaScript?

A). Type and value equality

B). Type equality only

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Which statement correctly declares a JavaScript array?

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A). colors.push('blue');

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What is the correct way to declare a JavaScript class?

A). class Rectangle {}

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How can you convert a string to a number in JavaScript?

A). parseInt('10')

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D). All of the above