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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The static SIMD.%type%.shiftLeftByScalar() method returns a new instance with the lane values shifted left by a given bit count (a << bits).


SIMD.Int8x16.shiftLeftByScalar(a, bits)
SIMD.Int16x8.shiftLeftByScalar(a, bits)
SIMD.Int32x4.shiftLeftByScalar(a, bits)

SIMD.Uint8x16.shiftLeftByScalar(a, bits)
SIMD.Uint16x8.shiftLeftByScalar(a, bits)
SIMD.Uint32x4.shiftLeftByScalar(a, bits)


An instance of a SIMD type.
Bit count to shift by.

Return value

A new corresponding SIMD data type with the lane values shifted left by a given bit count (a << bits).


The bitwise left shift operation shifts the specified number of bits to the left. Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right.

For example, a bitwise left shift of 5 << 1 results in 1010 which is 10 in decimal.

5  0101
10 1010


Bitwise left shift of an Int32x4

var a = SIMD.Int32x4(1, 2, 4, 8);
SIMD.Int32x4.shiftLeftByScalar(a, 1);
// Int32x4[2, 4, 8, 16]


Specification Status Comment
The definition of 'SIMDConstructor.shiftLeftByScalar' in that specification.
Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support Nightly build No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support Nightly build No support No support No support

See also

Document Tags and Contributors

 Contributors to this page: fscholz
 Last updated by: fscholz,