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Question

Refer to the exhibits! The Set Payload transformer's value is set to {'year': '2020'}. What message value should be added to the Logger component to output the message 'The year is 2020', without hard-coding 2020?

Answer

A) #[The year is $(payload.year)]
B) The year is #[payload.year]
C) #["The year is " + payload.year]
D) #["The year is ++ payload.year"]

The correct answer to this question is B.

Explanation

First you should notice that the property "year" is a string, not an integer, which could be important in a case of concatenation. The answer A is wrong because of the dollar sign, which could be used only if you would want to access something from the global configuration file. Answer C is eliminated because of the usage of the mathematical addition operator "+". Answer D is the tricky one. It almost looks good, especially if you take into consideration that the property "year" is a string, which could easily lead you to the conclusion that this concatenation would make sense. Nevertheless, it is wrong, because the whole expression "The year is ++ payload.year" is written as a string and that is exactly what would be the output of the logger. Three eliminated answers lead us to the answer B as the correct one.