adventofcode2017_day2_1.js

function calc(input) {
    var checksum = 0;
    input.split('\n').forEach(row => {
        var nums = row.split('\t').map(n => parseInt(n));
        var min = nums.reduce((a, b) => Math.min(a, b));
        var max = nums.reduce((a, b) => Math.max(a, b));
        checksum += max - min;
    });
    return checksum;
}