CODEWITHSUNDEEP
javascriptcoffeescript
Niels B.
Niels B.

Reputation: 6310

Augment properties with literal notation

Let's assume I have the following CoffeeScript code:

person =
  name: 'Alice'

Now, I want to augment this object with two additional properties. The common way is to write:

person.age = 34
person.bestFriend = 'Bob'

However, I don't like repeating person. What I do like however, is writing:

person =
  age: 34
  bestFriend: 'Bob'

(Unfortunately) This creates a whole new object and assigns it to the person variable, meaning Alice has lost her name. Is there a nicer way to augment an object in CoffeeScript besides writing property assignments line by line? Something like:

person.augment
  age: 34
  bestFriend: 'Bob'

Upvotes: 1

Views: 59

Answers (1)

epidemian
epidemian

Reputation: 19229

Not as a language feature, but writing a simple extend function is easy enough (or use an existing version on Underscore or jQuery):

extend = (dst, src) ->
  dst[k] = src[k] for k of src
  dst

person =
  name: 'Alice'

extend person,
  age: 34
  bestFriend: 'Bob'

Upvotes: 2

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