Set Intersection

Set Intersection

var fs  = require("fs");
fs.readFileSync(process.argv[2]).toString().split('\n').forEach(function (line) {
    if (line != "") {
        console.log(processLine(line));
    }
});

function processLine(line) {
    var lists = line.split(";");

    var list1 = lists[0].split(",");
    for(var i=0; i<list1.length; i++) { list1[i] = parseInt(list1[i]); }
    var list2 = lists[1].split(",");
    for(var i=0; i<list2.length; i++) { list2[i] = parseInt(list2[i]); }
    var listReturn = [];

    for (var i = 0; i < list1.length; i++) {
        if (list2.indexOf(list1[i]) != -1) {
            listReturn.push(list1[i]);
        }
    }
    return listReturn.join();
}