If the JavaScript operator + is used in an arithmetic expression, what is the result?

• A. The operator subtracts the second operand.
• B. The expression treats + as an addition operator and sums the values.
• C. The operator performs string concatenation only.
• D. The operator multiplies the operands.

Answer: (B)

The plus operator in a JavaScript arithmetic expression adds the operands. When both sides are numbers, it returns their numeric sum. JavaScript can also be used for strings with the same operator, in which case it concatenates. So in a pure arithmetic context with numbers, the result is the sum of the values. For example, 2 + 3 yields 5. If a string is involved, like "2" + 3, JavaScript would produce "23" due to concatenation, which is why keeping operands as numbers is important for true arithmetic addition.