Which of these is the correct syntax for string concatenation in JavaScript?A. str1 + str2None of these options.Both A and B.B. str1.concat(str2)

Step 1: Break Down the Problem

We need to identify the correct syntax for string concatenation in JavaScript among the given options:

• A: str1 + str2
• B: str1.concat(str2)

Step 2: Relevant Concepts

In JavaScript, there are primarily two ways to concatenate strings:

1. Using the + operator.
2. Using the String.prototype.concat() method.

Step 3: Analysis and Detail

• Option A: str1 + str2

  • This is a commonly used method for concatenating strings in JavaScript. It combines the two strings into one.

• Option B: str1.concat(str2)

  • This is also a valid method for string concatenation in JavaScript. It calls the concat method of the string object, combining the strings.

Both options A and B are valid for string concatenation.

Step 4: Verify and Summarize

Since both option A and option B represent correct methods for concatenating strings in JavaScript, the answer includes both options.

Final Answer

Both A and B are correct methods for string concatenation in JavaScript.