public static EcmaValue CopyWithin([This] EcmaValue thisValue, EcmaValue target, EcmaValue start, EcmaValue end)
{
TypedArray array = thisValue.GetUnderlyingObject <TypedArray>();
Guard.BufferNotDetached(array);
int len = array.Length;
int to = ArrayHelper.GetBoundIndex(target, len, 0);
int from = ArrayHelper.GetBoundIndex(start, len, 0);
int until = ArrayHelper.GetBoundIndex(end, len, len);
int count = Math.Min(until - from, len - to);
if (count > 0)
{
int elementSize = array.ElementSize;
int srcOffset = (int)(from * elementSize + array.ByteOffset);
int dstOffset = (int)(to * elementSize + array.ByteOffset);
Guard.BufferNotDetached(array);
ArrayBuffer.CopyBytes(array.Buffer, srcOffset, array.Buffer, dstOffset, (int)count * elementSize);
}
return(thisValue);
}