Adobe 65036570 Scripting Guide - Page 56

ADOBE DIRECTOR 11.0 19 Scripting Dictionary In the following example, the first statement illustrates a binary operator, where the variables x and y are operands and the plus (+) sign is the operator. The second statement illustrates a unary operator, where the variable i is the operand and ++ is the operator. // JavaScript syntax x + y; // binary operator i++; // unary operator For reference information on operators, see "Operators" on page 606. Understanding operator precedence When two or more operators are used in the same statement, some operators take precedence over others in a precise hierarchy to determine which operators to execute first. This is called the operators' precedence order. For example, multiplication is always performed before addition. However, items in parentheses take precedence over multiplication. In the following example, without parentheses the multiplication in this statement occurs first: -- Lingo syntax total = 2 + 4 * 3 -- results in a value of 14 When parentheses surround the addition operation, addition occurs first: -- Lingo syntax total = (2 + 4) * 3 -- results in a value of 18 Descriptions of the types of operators and their precedence order follow. Operators with higher precedence are performed first. For example, an operator whose precedence order is 5 is performed before an operator whose precedence order is 4. Operations that have the same order of precedence are performed left to right. Arithmetic operators Arithmetic operators add, subtract, multiply, divide, and perform other arithmetic operations. Parentheses and the minus sign are also arithmetic operators. Operator ( ) * mod / % ++ -- + - Effect Precedence Groups operations to control precedence order. 5 When placed before a number, reverses the sign of a number. 5 Performs multiplication. 4 (Lingo only) Performs modulo operation. 4 Performs division. 4 (JavaScript syntax only) Returns the integer remainder of dividing two operands. 4 (JavaScript syntax only) Adds one to its operand. If used as a prefix operator (++x), 4 returns the value of its operand after adding one. If used as a postfix operator (x++), returns the value of its operand before adding one. (JavaScript syntax only) Subtracts one from its operand. The return value is analogous 4 to that of the increment operator. When placed between two numbers, performs addition. 3 When placed between two numbers, performs subtraction. 3