using let/const instead of var

README.md

@@ -36,11 +36,11 @@ TCP Client Example
 --------------
 ```javascript
 // create a tcp modbus client
-let Modbus = require('jsmodbus')
-let net = require('net')
-let socket = new net.Socket()
-let client = new Modbus.client.TCP(socket, unitId)
-let options = {
+const Modbus = require('jsmodbus')
+const net = require('net')
+const socket = new net.Socket()
+const client = new Modbus.client.TCP(socket, unitId)
+const options = {
 'host' : host
 'port' : port
 }
@@ -52,13 +52,13 @@ RTU Client Example
 ```javascript
 
 // create a tcp modbus client
-let Modbus = require('jsmodbus')
-let SerialPort = require('serialport')
-let options = {
+const Modbus = require('jsmodbus')
+const SerialPort = require('serialport')
+const options = {
 baudRate: 57600
 }
-let socket = new SerialPort("/dev/tty-usbserial1", options)
-let client = new Modbus.client.RTU(socket, address)
+const socket = new SerialPort("/dev/tty-usbserial1", options)
+const client = new Modbus.client.RTU(socket, address)
 ```
 
 Client API Example
@@ -94,10 +94,10 @@ Server example
 --------------
 ```javascript
 
-let modbus = require('jsmodbus')
-let net = require('net')
-let server = new net.Server()
-let server = new modbus.server.TCP(server)
+const modbus = require('jsmodbus')
+const net = require('net')
+const server = new net.Server()
+const server = new modbus.server.TCP(server)
 
 server.listen(502)
 

examples/serial/ListSerialInterfaces.js

@@ -1,6 +1,6 @@
 'use strict'
 
-var SerialPort = require('serialport')
+const SerialPort = require('serialport')
 
 SerialPort.list(function (err, ports) {
   if (err) {

examples/serial/WriteMultipleCoils.js

@@ -1,7 +1,7 @@
 'use strict'
 
-var ModbusClient = require('../..')
-var client = ModbusClient('/dev/tty0', 9600)
+const ModbusClient = require('../..')
+const client = ModbusClient('/dev/tty0', 9600)
 
 client.on('connect', function () {
   client.writeMultipleCoils(0, [1, 1, 1]).then(function (resp) {

examples/tcp/Reconnect.js

@@ -1,19 +1,19 @@
 'use strict'
 
-var modbus = require('../..')
-var client = modbus.client.tcp.complete({
+const modbus = require('../..')
+const client = modbus.client.tcp.complete({
   'host': process.argv[2],
   'port': process.argv[3],
   'autoReconnect': false,
   'logEnabled': true
 }).connect()
-var successCount = 0
-var errorCount = 0
-var reconnectCount = 0
-var closedOnPurpose = false
-var firstTime = true
+const successCount = 0
+const errorCount = 0
+const reconnectCount = 0
+const closedOnPurpose = false
+const firstTime = true
 
-var start = function () {
+const start = function () {
   console.log('Starting request...')
 
   client.readHoldingRegisters(process.argv[4], process.argv[5]).then(function (resp) {
@@ -48,7 +48,7 @@ client.on('connect', function () {
   start()
 })
 
-var shutdown = function () {
+const shutdown = function () {
   closedOnPurpose = true
 
   client.close()

examples/tcp/WriteMultipleCoils.js

@@ -10,7 +10,7 @@ const options = {
 const client = new modbus.client.TCP(socket)
 
 socket.on('connect', function () {
-  var values = Buffer.from([0xff])
+  const values = Buffer.from([0xff])
 
   client.writeMultipleCoils(13, values, 8)
     .then(function (resp) {

src/request/write-multiple-coils.js

@@ -78,7 +78,7 @@ class WriteMultipleCoilsRequestBody extends ModbusRequestBody {
       let cntr = 0
       const bytes = Buffer.allocUnsafe(this._numberOfBytes)
 
-      for (var i = 0; i < len; i += 1) {
+      for (let i = 0; i < len; i += 1) {
         curByte += this._values[i] ? Math.pow(2, cntr) : 0
 
         cntr = (cntr + 1) % 8