Optimized with binary search (can't figure out why ycomb formats my code all ugly)

var speed = 500;

[rin, bin, gin].forEach(col => { col.valueAsNumber = 7; col.dispatchEvent(new Event('change')); col.score = 0; });

async function tryit(col, value) { col.valueAsNumber = value; col.dispatchEvent(new Event('change')); submit.click(); await new Promise(resolve => setTimeout(resolve, speed)); var res_text = result.innerText.split(/[ ()%]/)[4]; if (res_text === "Splendid!") { throw new Error("Finished - Found correct combination"); } col.score = parseInt(res_text); return col.score; }

async function binarySearch(col) { let start = 0; let end = 15; let mid = 7; let startAccuracy = await tryit(col, start); let endAccuracy = await tryit(col, end); let midAccuracy = 0;

    while (true) {
        mid = Math.floor((start + end) / 2);
        midAccuracy = await tryit(col, mid);

        if ((end - start) <= 2) {
            const max = Math.max([startAccuracy, midAccuracy, endAccuracy]);
            if (startAccuracy == max) await tryit(col, start);
            else if (midAccuracy == max) await tryit(col, mid);
            else await tryit(col, end);
            return;
        }

        if (endAccuracy > startAccuracy) {
            start = mid;
            startAccuracy = midAccuracy;
        } else {
            end = mid;
            endAccuracy = midAccuracy;
        }
    }

} async function findOptimalCombination() { for (const col of [rin, gin, bin]) { await binarySearch(col); } /* rounding */ for (const col of [rin, gin, bin]) { const mid = col.valueAsNumber; const score = await tryit(col, mid); const left = await tryit(col, mid - 1); if (score >= left) { const right = await tryit(col, mid + 1); if (score >= right) await tryit(col, mid); } } console.log("Optimization complete"); }

await findOptimalCombination();