Writing Scripts in Nashorn - Scripting in Java: Integrating with Groovy and JavaScript - page 61

Table 4-5. ( continued )

Operator Name Syntax Description

|| op1 || op2 Returns op1 or op2 . If op1 is true or can

be converted to true , op1 is returned.
Otherwise, op2 is returned.

Logical OR

?: op1 ? op2 :

op3

If op1 evaluates to true, returns the value
of op2. Otherwise, returns the value of
op3.

Conditional
or ternary
operator

= op1 = op2 Assigns the value of op2 to op1 and

returns op2 .

Assignment

+=, -=,
*=, /=,
%=, <<=,
>>=, >>>=,
&=, ^=, |=

op1 op= op2 Works as if a statement like op1 = op1 op

op2 is executed. Applies the operation
(+, =, *, /, %, etc.) on op1 and op2 , assigns
the result to op1 and returns the result.

Compound
assignment

, op1, op2,

op3...

Comma
operator

Evaluates each of its operands from left
to right and returns the value of the last
operand. Used in locations where one
expression is required, but you want to
use multiple expressions, for example, in
a for loop header.

Operators have precedence. In an expression, operators with the higher precedence
are evaluated before operators with the lower precedence. Like Java, you can enclose part
of an expression in parentheses that has the highest precedence. The following is the list
of precedence of operators. Operators at level 1 have higher precedence than those at
level 2. Operators at the same level have the same precedence:
1. ++ (Postfix increment), -- (postfix decrement)
2. !, ~, + (Unary plus), - (Unary negation), ++ (Prefix
increment), -- (Prefix decrement), typeof , void , delete
3. *, /, %
4. + (Addition), - (Subtraction)
5. << , >>, >>>
6. <, <=, >, >=, in, instanceof
7. ==, !=, ===, !==
8. &
9. ^
10. |