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Showing content from https://webplatform.github.io/docs/javascript/operators/bitwise_xor_assignment below:

bitwise xor assignment · WebPlatform Docs

bitwise xor assignment Summary

Performs a bitwise exclusive OR on a variable and an expression and assigns the result to the variable.

Syntax

result ^= expression

result: Any variable.
expression: Any expression.

Examples

See Remarks.

var x = 5;
x ^= 12;

Remarks

Using the ^= operator is exactly the same as specifying:

result = result ^ expression

The ^= operator looks at the binary representation of the values of two expressions and does a bitwise exclusive OR operation on them. The result of this operation behaves as follows:

0101    (result)
1100    (expression)
----
1001    (result)

When one, and only one, of the expressions has a 1 in a digit, the result has a 1 in that digit. Otherwise, the result has a 0 in that digit.