Why console.log(obj[content]) First 'bike' is undefined

Question

const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck' ];
let ans = data.reduce((obj,content)=>{
console.log(obj);
console.log(obj[content]);
if(!obj[content])obj[content]=1;
else obj[content] += 1;
return obj
},{});
console.table(ans);

Answer 1

蕭育杭 Can you make post this code and share the link here?