Field Operator

Symbol: .

Field or element getting#

Gets a field from map or an element from list.

Example:

= list :: 1 2 3
= map : (a 1) (b 2)

console.log (. list 0)
console.log (. map 'a')

Set dynamic key for a map field. Translated to JavaScript as {[key]:value}.

Example:

= key 'name'
= value 'John'
= object :
  . key value

If you want to call a function that is stored as field in the map you don't need to the following:

= numbers :: 1 2 3
= incrementedNumbers
  (. numbers 'map') (-> x (+ x 1))

You can just do this:

= numbers :: 1 2 3
= incrementedNumbers
  .map numbers (-> x (+ x 1))

or even this:

= numbers :: 1 2 3
= incrementedNumbers
  numbers.map (-> x (+ x 1))