8.2.5 Concatenation Operator (&)

Used to force string concatenation of two expressions.
Syntax
result = expression1 & expression2
Arguments
- result
- Any variable.
- expression1
- Any expression.
- expression2
- Any expression.
Remarks
Whenever an expression is not a string, it is converted to a String subtype. If both expressions are Null, result is also Null. However, if only one expression is Null, that expression is treated as a zero-length string ("") when concatenated with the other expression. Any expression that is Empty is also treated as a zero-length string.
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