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Left Shift Assignment Operator (<<=) (JavaScript)

Moves the specified number of bits to the left and assigns the result to result. The bits vacated by the operation are filled with 0.

result <<= expression


Any variable.


The number of bits to move.

Using the <<= operator is the same as specifying result = result << expression

The following example shows how to use the <<= operator.

// 14 is 00000000000000000000000000001110
var temp = 14;
temp <<= 2; 
// 56 is 00000000000000000000000000111000
Output: 56

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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