フォールスルーを活用方法を理解する必要がある

コード 19行

switch (Number(lamp)) {
    case 1: return;
    case 6:
        derby_king       = "-";
        doguti_sp        = "-";
        aiti_giant       = "-";
    case 5:
        tukemai_kosya    = "-";
        koiten           = "-";
        ipan_oni         = "-";
    case 4:
        kanto_gamashi    = "-";
        teikai_hiroin    = "-";
    default:
        kakedasi         = "-";     
        atozaki          = "-";     
        saikyo_b2        = "-";
}

元のコード 20行

if(Number(lamp) === 1) return;
if((Number(lamp) < 4)){ 
    kakedasi         = "-";     
    atozaki          = "-";     
    saikyo_b2        = "-";
}
if((Number(lamp) < 5)){ 
    kanto_gamashi    = "-";
    teikai_hiroin    = "-";
}
if((Number(lamp) < 6)){ 
    tukemai_kosya    = "-";
    koiten           = "-";
    ipan_oni         = "-";
}
if((Number(lamp) === 6)){
    derby_king       = "-";
    doguti_sp        = "-";
    aiti_giant       = "-";
}