Equivalent for Java System.arraycopy in Dart?

Question

How do I convert the below java code to equivalent dart.

private static final byte[] mIdBytes = new byte[]{(byte) 0x01, (byte) 0x02, (byte) 0x03, (byte) 0x7E};

byte[] data;

System.arraycopy(mIdBytes, 2, data, 0, 4);

Is there any Dart method that does a similar kind of operation?

I was looking into this: https://pub.dev/documentation/ckb_dart_sdk/latest/ckb-utils_number/arrayCopy.html

Answer 1

To match Java's System.arrayCopy(source, sourceOffset, target, targetOffset, length) you should use

 target.setRange(targetOffset, targetOffset + length, source, sourceOffset);

This is more efficient than using List.copyRange for some lists, for example copying between typed-data lists with the same element size (like two Uint8Lists).