var obj = {A : 'a', B : 'b', C : 'c'};
Object.fromEntries(Object.entries(obj).map(a => a.reverse()))
return Object.entries(obj).reduce((ret, [key, value]) => {
ret[value] = key;
return ret;
}, {});
return Object.entries(obj).reduce((ret, [key, value]) => Object.assign(ret, { [value]: key }), {});
return Object.keys(obj).reduce((ret, key) => {
ret[obj[key]] = key;
return ret;
}, {});