This program asks the user to enter things, until they enter an empty string, when it finishes, printing the things they entered.

recurse.js

//This just sets up readline
var rl = require('readline').createInterface({
    input: process.stdin,
    output: process.stdout
});

function getThingsFromTheCommandLine(done) {
    //rl.question asks for a prompt, and calls callback with the result
    rl.question("Enter something: ", function (answer) {
        if (answer.trim() === '') return done([]);

        getThingsFromTheCommandLine(function (r) {
            done([answer].concat(r));
        });
    });
}

getThingsFromTheCommandLine(function (results) {
    console.log('Entered: ', results);
    rl.close();
});


// $ node experiment.js
// Enter something: 1
// Enter something: 2
// Enter something: 3
// Enter something: 4
// Enter something:
// Entered:  [ '1', '2', '3', '4' ]