random.js

var WebSocket = require('ws')

var ws = new WebSocket('ws://localhost:5000')

function rand(lim) {
  return Math.floor(Math.random(lim) * lim)
}

function sample(col) {
  return col[rand(col.length)]
}

ws.on('message', function(message) {
  // parse the state from the server
  var state = JSON.parse(message)

  // print out debugging information
  console.log('tick', state.tick)
  console.log('me', state.me)

  // Just move randomly
  var dirs = ['←', '↓', '↑', '→']
  var cmd = ['MOVE', sample(dirs)]

  // send the next command
  ws.send(JSON.stringify(cmd))
})