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Official ZPE Programming Environment documentationReference functions

Chainable functions or object functions are functions that can be run on an element or value. For example, a lot of languages expose a toString() or similar function on elements or values. ZPE also adds this too, and it's easy to do:

YASS
$a = 43
print($a.to_string())
$b = [43, 49]
print($b.get(1))
  

This example is pretty poor, since the print function already transforms it's input to a string. However, the second example will correctly select an element from the list.

The decision to use reference pointer (the dot .) instead of the arrow (->) was based on the confluence of different language concepts and to keep everything object-oriented syntactically similar - lists and associative arrays are not objects but they have underlying functions so the dot suits them whereas the arrow suits objects.

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