Precedence of operators in JavaScript

Operator Precedence
Operator precedence in JavaScript is a set of rules. This rule controls the order in which operators execute when evaluating expressions. Operations with higher precedence are performed Mr. Foo the operators of lower precedence. For example, multiplication is performed prior to addition.

The following table lists the JavaScript operators by priority from highest to lowest. Operators with the same precedence are evaluated in order from left to right.

Operator	Describe
. [] ()	field access, array subscripts, function calls, and expression grouping
++ -- - ~ ! Delete new typeof void	Unary operators, return data types, object creation, undefined values
* / %	Multiplication, division, modulo
+ - +	addition, subtraction, string connection
<< >> >>>	Shift
< <= > >= instanceof	Less than, equal to, greater than, greater than or equal to, instanceof
== != === !==	Equal, not equal, strictly equal, not strictly equal
&	Bitwise-AND
^	Bitwise XOR OR
|	Bitwise OR
&&	Logic and
||	Logical OR
?:	Conditions
= op=	Assignment, Operation assignment
,	Multi-value evaluation

Parentheses can be used to change the order of evaluation determined by the operator precedence. This means that the expression in parentheses should be evaluated all before it is used for the remainder of the expression.

z = * (3 + +)

There are five operators in the expression: =, *, (), +, and another +. Based on the rules for operator precedence, they are evaluated in the following order: (), +, +, *, =.

The expression in parentheses is evaluated first. There are two addition operators in the parentheses. Because two addition operators have the same precedence, they are evaluated from left to right. Add 96 and 3 first, then add it and add it to 45, resulting in 144.
Then the multiplication operation. 78 times 144 to get the result 11232.
A finally an assignment operation. Assign 11232 to Z.

Precedence of operators in JavaScript