js-switch case结构还能写成什么样？

switch case结构

function doAction(action) {
    switch (action) {
        case '20':
            return 'enough';
        case '10':
            return 'not enough';
        default:
            return 'retry!'
    }
}
let a = prompt('请输入数字：');
console.log(doAction(a));

对象加函数结构

function doAction(action){
    let actions = {
        '20': ()=>{
            return 'enough';
        },
        '10': ()=> {
            return 'not enough';
        }
    }
    if (typeof actions[action] !== 'function') {
        throw new Error('retry!');
    }
    return actions[action]();
};

let a = prompt('请输入数字：');
console.log(doAction(a));