Ramda utilities

ramda.utils.js

// applying spec of functions to initial passed object
const mergeSpec = R.curry(function mergeSpec(spec, value) {
  return R.converge(R.merge, [R.identity, R.applySpec(spec)])(value)
})

// now we can combine data from different props and apply it to the original object

const getFullName = R.pipe(R.pick(['first_name', 'last_name']), R.values, R.join(' '))

const combineLikesAndComments = R.converge(R.concat, [
  R.propOr([], 'likes'),
  R.propOr([], 'comments')
])

// now simply create a spec similar to R.applySpec 
const updateUser = mergeSpec({ full_name: getFullName, likesAndComments: combineLikesAndComments})

// now just call the new function on the user object
updateUser({ 
  first_name: 'John', 
  last_name: 'Doe', 
  likes: ['sun', 'moon'], 
  comments: ['hello', 'world']
})

// Will return
//
// {
//   "comments": ["hello", "world"], 
//   "first_name": "John", 
//   "last_name": "Doe", 
//   "likes": ["sun", "moon"], 
//   "full_name": "John Doe",  // -- combined name
//   "likesAndComments": ["sun", "moon", "hello", "world"] // -- combined lists
// }


// as you can imaging, possibilities are just endless here