My ES6 implementation of Rails' style #try()

try-like-rails.js

// Traverse an object and attempt to extract the value(s) of one
// or more properties, without worrying about non-Object values.

const maybe = (obj, traverse, fields) => {
  if (!(fields instanceof Array)) {
    fields = [fields]
  }

  let result

  try {
    const leaf = traverse.reduce((memo, prop) => memo[prop], obj)

    result = fields.reduce((memo, field) => {
      leaf[field].wuut
      return { ...memo, [field]: leaf[field] }
    }, {})
  } catch(e) {}

  return result
}

// Example:
// const foo = { ciao: { what: 'Pizza', where: 'Pisa' } }
//
// maybe(foo, ['ciao'], 'what') -> { what: 'Pizza' }
// maybe(foo, ['ciao'. 'bello'], 'what') -> undefined
// maybe(foo, ['ciao'. 'bello'], ['what', 'where']) -> { what: 'Pizza', where: 'Pisa' }