Claude 总结问卷的百分比为什么对不上？把分母写出来

把方法变成一次练习

// 单选虚构问卷：null=未回答；不能用于多选、加权或抽样推断。
export function summarizeSurvey(rows){
 if(!Array.isArray(rows)||rows.length===0)throw Error('需要非空记录');
 const seen=new Set(),counts={A:0,B:0};let missing=0;
 for(const r of rows){
  if(typeof r?.id!=='string'||!r.id||seen.has(r.id))throw Error('ID缺失或重复');seen.add(r.id);
  if(r.answer===null)missing++;else if(r.answer==='A'||r.answer==='B')counts[r.answer]++;else throw Error('只接受A、B或null');
 }
 const total=rows.length,answered=total-missing;
 return {total,answered,missing,counts,aShareAll:counts.A/total,aShareAnswered:answered?counts.A/answered:null};
}
if(process.argv.includes('--demo'))console.log(JSON.stringify(summarizeSurvey(['A','A','A','A','B','B',null,null,null,null].map((answer,i)=>({id:'R'+i,answer})))));