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Extra info for JavaScript Language Specification
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2 Postfix Decrement Operator -PostDecrementExpression: PostfixExpression -- A postfix expression followed by a -- operator is a postfix decrement expression. The operand must be convertible into a number, and thus the result of the operation must be a variable of type number or a run-time error occurs. The result of the postfix decrement expression is not a variable, but a value. At run time, the value 1 is subtracted from the value of the variable and the difference is stored back into the variable.
The boolean equality operators are associative as well as commutative. The result of == is true if the operands are both true or both false; otherwise the result is false. = is false if the operands are both true or both false; otherwise the result is true. = behaves the same as ^ when applied to boolean operands. 12 Bitwise and Logical Operators The bitwise and logical operators include the AND operator &, exclusive OR operator ^, and inclusive OR operator |. These operators have different precedence, with & having the highest precedence and | the lowest precedence.
1 Postfix Increment Operator ++ PostIncrementExpression: PostfixExpression ++ A postfix expression followed by a ++ operator is a postfix increment expression. The operand must be convertible into a number, and thus the result of the operation must be a variable of type number or a run-time error occurs. The result of the postfix increment expression is not a variable, but a value. At run time, the value 1 is added to the value of the variable and the sum is stored back into the variable. The value of the postfix increment expression is the value of the variable before the new value is stored.
JavaScript Language Specification
by Brian
4.3