learnyounode

2.js

// the solution presented
    var result = 0

    for (var i = 2; i < process.argv.length; i++)
      result += Number(process.argv[i])

    console.log(result)
    
// what i wrote
// ignore node and the filename.
var numbers = process.argv.slice(2);
var sum = numbers.reduce(function(previousValue, currentValue, index, array) {
    return parseInt(previousValue) + parseInt(currentValue);
});
console.log(sum);

This seems perfectly legit to me!

MDN even gives reduce as an example of array sum:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce#Example.3A_Sum_up_all_values_within_an_array