Reverse an object's (sorted!) order by mapping it into an array where the object's key is included within the new constructed object.

reverseObject.js

const reverseObjIntoArray = obj => Object.keys(obj).sort().reverse().map(key=> ({ key, ...obj[key] }))

reverseObjIntoArray({
  124: {
    a: 'foo',
    b: 'bar'
  },
  119: {
    a: 'foo',
    b: 'bart'
  },
  127: {}
})

/**
// Logs:
[{
  key: 127
},
{
  key: 124,
  a: 'foo',
  b: 'bar'
},
{
  key: 119,
  a: 'foo',
  b: 'bart'
}]
*/