Prototype withHandlers HoC to declare updater handlers based on object keys.

withPropertyHandlers.js

// Definition - withPropertyHandlers.js
import { compose, withHandlers } from 'recompose'

function upperCaseFirstCharacter(str) {
  return `${str.charAt(0).toUpperCase()}${str.slice(1)}`
}
export default function withPropertyHandlers(
  properties,
  updaterName,
  updater,
  handlersPrefix = 'update',
) {
  const keyHandlers = properties.reduce((handlers, property) => {
    return {
      ...handlers,
      [`${handlersPrefix}${upperCaseFirstCharacter(property)}`]: props =>
        props[updaterName](property),
    }
  }, {})
  return compose(
    withHandlers({
      [updaterName]: updater,
    }),
    withHandlers(keyHandlers),
  )
}


// Implementation - form.js
const enhance = withPropertyHandlers(
  ['test', 'test2'], 
  'updater', 
  ({ optinForm, updateOptinForm }) => name => value => {
  updateOptinForm({
    ...optinForm,
    [name]: value,
  })
})

// Generated sub handler used
const Component = enhance(({ updateTest, updateTest2 }) => null)