const findLastKey = (obj, fn) => Object.keys(obj).reverse() .find(key => fn(obj[key]));
測試:
findLastKey(
{
barney: { age: 36, active: true },
fred: { age: 40, active: false },
pebbles: { age: 1, active: true }
},
o => o['active']
); // 'pebbles'
還是比較簡單的,先拿到所有的key,然後反轉一下key的數組,然後根據條件篩出第一個key即可。