// 字节跳动面试题目：利用已知函数 add 实现 asyncSum。
function add (a, b, callback) {
callback(a + b)
}
async function asyncSum(...args) {
let result =0
for(const s of args){
result = await asyncAdd(result,s)
}
return result
}
async function asyncAdd(a,b){
return new Promise((resolve)=>{
add(a,b,resolve);
})
}
(async ()=>{
const result = await asyncSum(1,2,3,4,5,6)
console.log(result)
})()
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