Computes the sum of two numbers or permits expression of a positive number.
expression1 + expression2
- Required in the binary form; a numeric or string expression
- Required in the unary form; a numeric expression
- Required in the binary form; an expression of a type compatible with expression1
The binary + operator adds the values of two numeric expressions and returns their numeric sum.
If both expressions are of type string, the result is a new string formed by the concatenation of expression1 and expression2, in that order. It is functionally equivalent to the & operator, but has slightly higher precedence.
The unary + operator passes the numeric value of expression1 unchanged. Thus, it is often referred to as the identity function in mathematics.