javascript - Nodejs: Attach Event Listener to Array If contains value -


in project have 4 objects (connectors hw decoders), synchronous. , array (queue) of strings decryption. there anyway how check if array contains values decoder objects? think can via eventemitters, don't know how.

thanks help

-update

incoming value server 64bites string, decoder returns 15 bites value. communication via serial port i'm using package serialport. know how communication 1 decoder, don't know how more (in proper way).

my code communication 1 decoder.

var serialport = require('serialport'); var ports = []; ports.push( {device: new serialport('/dev/cu.usbmodem1411', { autoopen: false }), enable: true}); ports.push( {device: new serialport('/dev/cu.usbmodem1421', { autoopen: false }), enable: true});   //id: incoming encrypted value module.exports.decryption = function (id, callback) {      ports[0].enable = false;     var idarray = [];     idarray[0] = id.slice(0, 16);     idarray[1] = id.slice(16, 32);     idarray[2] = id.slice(32, 48);     idarray[3] = id.slice(48, 64);      ports[0].device.open(function (err) {         if (err) {             return console.log('error opening port: ', err.message);         }         port[0].device.write('d01');         let index = 0;         var buffer = setinterval(function () {             port[0].device.write(idarray[index]);             if (index === idarray.length - 1) clearinterval(buffer);             index++;         }, 1);      });      ports[0].device.on('data', function (data) {         callback( hex2a(data.tostring('ascii')));         ports[0].device.close(function (response) {             console.log("device disconnected")         },function (error) {  });         ports[0].enable = true;     }); };  function hex2a(hexx) {     var hex = hexx.tostring();//force conversion     var str = '';     (var = 0; < hex.length; += 2)         str += string.fromcharcode(parseint(hex.substr(i, 2), 16));     return str; }


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