stdin/stdout pipe in node.js

hackerRankExample.js

process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function solveMeFirst(a, b) {
    return a+b;
}

function main() {
    // write your code here.
    // call `readLine()` to read a line.
    // use console.log() to write to stdout

    var a = parseInt(readLine());
    var b = parseInt(readLine());;

    var res = solveMeFirst(a, b);
    console.log(res);
}

test1.js

// So this is short and easier

process.stdin.resume()
process.stdin.on('data', function(data) { process.stdout.write(data) })
process.stdout.on('error', function(err) {
  if (err.code === 'EPIPE') return process.exit()
  process.emit('error', err)
})

test2.js

// But is this more "correct"?

process.stdin.resume()
process.stdin.on('data', function(data) { process.stdout.write(data) })
process.stdout.on('error', function epipeFilter(err) {
  if (err.code === 'EPIPE') return process.exit()
  // If there's more than one error handler (ie, us), then the error won't be bubbled up anyway
  if (process.stdout.listeners('error').length <= 1) {
    process.stdout.removeAllListeners() // Pretend we were never here
    process.stdout.emit('error', err) // Then emit as if we were never here
    process.stdout.on('error', epipeFilter) // Then reattach, ready for the next error!
  }
})