Mutator

mutator.js

const { keys, assign } = Object

const exampleSource = {
  first_name: 'Bob',
  last_name: 'Boberson',
  charity_1: '1',
  charity_2: '2',
  charity_3: '3'
}

const exampleMutation = {
  name ({
    first_name,
    last_name
  }) {
    return `${first_name} ${last_name}`
  },

  charity_id ({
    charity_1,
    charity_2,
    charity_3
  }) {
    return [
      charity_1,
      charity_2,
      charity_3
    ]
  }
}

const mutator = (mutation) => (source) => (
  keys(mutation).reduce((acc, key) => (assign(acc, {
    [key]: mutation[key](source)
  })), {})
)

const exampleMutator = mutator(exampleMutation)

console.log(exampleMutator(exampleSource))