Underscore recursive _.defaults (deepDefaults)

underscore.deep.defaults.js.coffee

# _.deepDefaults
# inspired by _.defaults but adds recursivity
# https://gist.github.com/fonji/dc279bbf23152d158fc4
#
# Example:
#    _.deepDefaults(
#      {bar: {a: 'a', c: 'c'}},
#      {foo: 'foo', bar: {a: 'b', d:'d'}}
#    )
#    will result in
#    {bar: {a: 'a', c: 'c', d:'d'}, foo: 'foo'}
# Changelog:
#    v0.1.0 creation (fonji)

_.mixin
  # fn(original,newOne,anotherNewOne,...)
  # works recursively for objects, not for arrays
  deepDefaults: (original, newObj) ->
    # TODO: make this work for more than one newObj
    result = {}
    for key, value of original
      if newObj[key]? && _.isObject(value) && _.isObject(newObj[key])
        result[key] = _.deepDefaults(value, newObj[key])
        continue
      result[key] = value
    for key, value of newObj
      continue if result[key]?
      result[key] = value
    result