怎么简写下面的赋值语句

Question

    let str = '';
    let len = 10;

    if(len == 0){
        str = 'aaa'
    }else if(len == 1){
        str = 'bbb'
    }else {
        str == 'ccc'
    }

三元表达式写起来好长，还有更好的写法吗

Answer 1

let len = 10;
let str = {'0': 'aaa', '1': 'bbb'}[len] || 'ccc';

Answer 2

switch或者像楼上那样写个对象，