What is the difference between VBScript’s + and & operator?

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The & operator does string concatenation, that is, forces operands to be converted to strings (like calling CStr on them first). +, in its turn, forces addition if one of the expressions is numeric. For example:

1 & 2

gives you 12, whereas

1 + 2
"1" + 2
1 + "2"

give you 3.

So, it is recommended to use & for string concatenation since it eliminates ambiguity.

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