mapping js objects

mapping_objects.js

const cats = {
  Puma: { age: 3 },
  Ringo: { age: 4 }
};

const object = Object.keys(cats)
                .map(cat => ({[cat]: `age: ${cats[cat].age}`}) )
                .reduce((acc, curr) => ({...acc, ...curr}) , {});

/* object:
  {
    Puma: "age: 3"
    Ringo: "age: 4"
  }
**/