B4R Question Difference in Log command

& = concatenation operator. It takes two strings and returns a new string which is the combination of both strings.

There is no such operator in B4R as joining strings requires dynamic memory allocation and is better avoided on small microcontrollers.
See this tutorial: Strings and Bytes

To make it easier for developers to log values, the Log command can receive any number of arguments. It logs each one of the arguments and adds an end of line character at the end.
This way you get the same result without creating new strings which will quickly lead to memory issues.

Ah ok. Thanks Erel.