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Microsoft® JScript™
<<= Operator
 Language Reference 
Version 1 

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Used to shift the bits of an expression to the left.
result <<= expression

The <<= operator syntax has these parts:

Part Description
result Any variable.
expression Any expression.

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

The <<= operator shifts the bits of result left by the number of bits specified in expression. For example:

var temp
temp = 14
temp <<= 2 

The variable temp has a value of 56 as 14 (00001110 in binary) shifted left two bits equals 56 (00111000 in binary). Bits are filled in with zeroes when shifting.

For information on when a run-time error is generated by the <<= operator, see the Operator Behavior table.

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