The first expression to evaluate. Should result in a number, point or color.
The second expression to evaluate. Should result in the same type as left or a number.
An expression that adds the results of the given expressions. Results in a number, point or color depending on the type of the operands. When a number is used with an other type, the operation is applied to the individual element values and the result is of the other type.
An expression that adds the result of the given expressions.