execute javascript in shell

js-shell.sh

#!/usr/bin/env bash

JS='
var input = "";

if (process.argv[1] === "-p") {
  process.stdin.resume();
  process.stdin.setEncoding("utf8");
  process.stdin.on("data", function(buf) {
    input += buf;
  });
  process.stdin.on("end", function() {
    eval(process.argv[2]);
  });
} else {
  eval(process.argv[1]);
}
'

node -e "$JS" -- "$@"

echo "[1, 2, 3, 4, 5]" | js -p "console.log(JSON.parse(input).map(el => el * 2));"