3a.js

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var m = 1;
var c = 3;
var treeCount = 0;

for (const mapLine of map) {
    if (m === 1) {
        m++;
        continue;
    }
    var lineLength = mapLine.length;

    if (mapLine[c] === "#") {
        treeCount++;
    }

    console.log('Mapline ' + m + ', character ' + (c + 1) + ': ' + mapLine[c] + ' - total: ' + treeCount);

    c += 3;
    if (c > lineLength - 1) {
        c -= lineLength;
    }

    m++;
}

console.log(treeCount);