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Bitwise OR Assignment Operator (|=) (JavaScript)

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

result |= expression


Any variable.


Any expression.

Using this operator is exactly the same as specifying:

result = result | expression

The |= operator looks at the binary representation of the values of result and expression and does a bitwise OR operation on them. The result of this operation behaves like this:

0101    (result)
1100    (expression)
1101    (output)

Any time either 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.

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

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