get-common-ratio.js

{
    const ratioConfig = (x, y) => ({
        x,
        y,
        ratio: x / y
    })
    
    const commonRatio = [ratioConfig(1, 1), ratioConfig(4, 3), ratioConfig(16, 9), ratioConfig(16, 10)];
  
    const getRatioConfig = (x, y) => {
        const ratio = x / y;
        const rank = [...commonRatio].map((r) => ({
            ...r,
            delta: Math.abs(r.ratio - ratio),
        })).sort((r1, r2) => r1.delta - r2.delta);
        return ratioConfig(rank[0].x, rank[0].y);
    }
    
    const ret = getRatioConfig(982, 737);
    console.log(ret.x, ret.y); // 4, 3
}