如何将以下Java代码转换为Node.js？

Question

I have the following Java code:

int data = Float.floatToIntBits(4.2);
sendCommand(0x50, data);

public void sendCommand(byte type, int data) {
  byte[] cmd = new byte[FRAME_LENGTH];
  cmd[0] = type;
  cmd[1] = (byte)(data);
  cmd[2] = (byte)(data >>> 8);
  cmd[3] = (byte)(data >>> 16);
  cmd[4] = (byte)(data >>> 24);
  printFrame(cmd);
}

I need to convert it to Node.js. I first thought to use the Buffer module, but I have no idea how to interpret the above code. Here is my attempt, but it doesn't seem correct:

const type = 0x50;
const data = 25;
function sendCommand(type, data) {
  const buff = Buffer.from([type, data, data >>> 8, data >>> 16, data >>> 24]);
  console.debug(buff);
}

Can you advise?

Answer 1

I was pretty close...
Since JavaScript converts hex data to integer on the fly, we need to set them as a string. So, instead of:

const type = 0x50;

We have to use:

const type = '0x50';

So, the equivalent of the Node.js program to the Java program posted in the question would be:

const type = '0x50';
const data = 25;
sendCommand(type, data);

function sendCommand(type, data) {
  const buff = Buffer.from([type, data, data >>> 8, data >>> 16, data >>> 24]);
  console.debug(buff);
}