use: (import (igropyr igropyr))

association list

Igropyr uses a kind of compound list structures, called association list.

Its composition is as follows:

((k1 . v1) (k2 . v2) (k3 . v3) ...)

The key may be a character, a number or a string. Thevalue can be a characters, a numbers, a strings or a procedure.

ref

procedure: (ref association-list key)

return: num, char, string or procedure

refuse to search a value by key in a association list .

val

procedure: (val association-list value)

return: num, char, string

valuse to search a key by value in a association list .