polyglot.js

const express = require('express')
const app = express()

const BigInteger = Java.type('java.math.BigInteger')

app.get('/', function (req, res) {
  var text = 'Hello World from Graal.js!<br> '

  // Using Java standard library classes
  text += BigInteger.valueOf(10).pow(100)
          .add(BigInteger.valueOf(43)).toString() + '<br>'

  // Using R interoperability to create graphs
  text += Polyglot.eval('R',
    `svg();
     require(lattice);
     x <- 1:100
     y <- sin(x/10)
     z <- cos(x^1.3/(runif(1)*5+10))
     print(cloud(x~y*z, main="cloud plot"))
     grDevices:::svg.off()
    `);

  res.send(text)
})

app.listen(3000, function () {
  console.log('Example app listening on port 3000!')
})