// AdventOfCode2018-01

var frequency = 0; 

// for each line in text file parse the symbol (first character) and the number into an array of objects 
var fs = require('fs'),
readline = require('readline'),
instream = fs.createReadStream('./input1.txt'),
outstream = new (require('stream'))(),
rl = readline.createInterface(instream, outstream);
    
rl.on('line', function (line) {
    console.log(line.substr(0,1));
    if (line.substr(0,1) = '+') {
        console.log(parseInt(line.substr(1)));
        frequency += parseInt(line.substr(1));
    }
    else {
        console.log(parseInt(line.substr(1)));
        frequency -= parseInt(line.substr(1));
    }
});

rl.on('close', function (line) {
    //console.log(line);
    //console.log('done reading file.');
});

console.log('The resulting frequency is ' + frequency);