Map

Symbol: :
Translated to JavaScript object.

Construction#

Takes key-field pairs as parameters.

Example:

= user :
  name 'John'
  age 13
  parents :
    mother :
      name 'Alice'
      age 42
    father :
      name 'Bob'
      age 39

You can use already declared names as key-field pair:

= name 'John'
= user :
  name
  age 13

Deconstruction#

You can put a map to first argument of abstraction operator =. In this case it deconstructs the value to it's structure and create named abstractions from its elements.

Example:

= user : (name 'John') (age 12)
= (: name) user
console.log name

You can rename the field while deconstructing:

= user : (name 'John') (age 12)
= (: (name title)) user
console.log title

You can deconstruct netsted maps:

= user :
  name 'John'
  age 12
  passport :
    id 1
    country 'USA'

= (: (passport (: id))) user
console.log id