how to run mocha tests on asynchronous functions in script


// async/await
it('responds with matching records', async function() {
const users = await db.find({ type: 'User' });
users.should.have.length(3);
});

// promise.then()
it('should save without error', function(done) {
var user = new User('Luna');
user.save(function(err) {
if (err) done(err);
else done();
});
});

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how to run multple port node


var http=require('http');
var ports = [7006, 7007, 7008, 7009];
var servers = [];
var s;
function reqHandler(req, res) {
console.log({
remoteAddress: req.socket.remoteAddress,
remotePort: req.socket.remotePort,
localAddress: req.socket.localAddress,
localPort: req.socket.localPort,
});
}
ports.forEach(function(port) {
s = http.createServer(reqHandler);
s.listen(port);
servers.push(s);
});

var http=require('http');
var url = require('url');
var ports = [7006, 7007, 7008, 7009];
var servers = [];
var s;
function reqHandler(req, res) {
var serPort=req.headers.host.split(":");
console.log("PORT:"+serPort[1]);//here i get it using http header.
}
ports.forEach(function(port) {
s = http.createServer(reqHandler);
s.listen(port);
servers.push(s);
});

var express = require('express');

let app1 = express();
let app2 = express();

app1.listen(3000, () => {
console.log("Started server on 3000");
});

app2.listen(3002, () => {
console.log("Started server on 3002");
});

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how to run react native app


npm install -g react-native-cli

//cd to the file where your react native projects will be
react-native init albums

// Run instructions for IOS/Android
cd projects/albums

npx react-native run-ios
npx react-native run-android

react-native run-android
react-native run-ios

npm install -g react-native-cli

npx react-native init AwesomeProject

react-native start

$ npx react-native init firstapp

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