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%.replaceLane() method returns a new SIMD data type with the given lane value replaced.


SIMD.Float32x4.replaceLane(t, index, value)
SIMD.Float64x2.replaceLane(t, index, value)

SIMD.Int8x16.replaceLane(t, index, value)
SIMD.Int16x8.replaceLane(t, index, value)
SIMD.Int32x4.replaceLane(t, index, value)

SIMD.Uint8x16.replaceLane(t, index, value)
SIMD.Uint16x8.replaceLane(t, index, value)
SIMD.Uint32x4.replaceLane(t, index, value)

SIMD.Bool8x16.replaceLane(t, index, value)
SIMD.Bool16x8.replaceLane(t, index, value)
SIMD.Bool32x4.replaceLane(t, index, value)
SIMD.Bool64x2.replaceLane(t, index, value)


An instance of a corresponding SIMD type.
An index number for which lane to replace.
A new value to be used for the lane.

Return value

A new SIMD data type with the given lane value replaced.


  • A TypeError, if t is not the corresponding SIMD type.
  • A RangeError, if the lane index is out of bounds.


var t = SIMD.Float32x4(1, 2, 3, 4);
SIMD.Float32x4.replaceLane(t, 2, 42); 
// Float32x4[1, 2, 42, 4]


Specification Status Comment
The definition of 'SIMDConstructor.replaceLane' 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


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

Experimental JavaScript Method SIMD