Specifications

var variable = expression;
The assignment operator is used to assign the value of an expression
to the variable.
= operator
It is an error to attempt to assign to a constant.
variable += expression;
This operator adds the value of the expression to the variable. It is the
same as:
variable = variable + expression;
but is shorter to write and less error-prone.
+= operator
See also += string operator.
variable -= expression;
This operator subtracts the value of the expression from the variable.
-= operator
variable *= expression;
This operator multiplies the value of the expression by the value of the
variable.
*= operator
variable /= expression;
This operator divides the value of the variable by the value of the
expression.
/= operator
variable %= expression;
This operator divides the variable by the expression and assigns the
remainder of the division (which may be 0), to the variable.
%= operator
variable &= expression;
This operator performs a bit-wise AND on the value of the expression
and the value of the variable and assigns the result to the variable.
&= operator
variable ^= expression;
This operator performs a bit-wise OR on the value of the expression
and the value of the variable and assigns the result to the variable.
^= operator
variable |= expression;
This operator performs a bit-wise OR on the value of the expression
|= operator
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