4 ms·

> Just replace multiple-value-returns with structs, they don't add anything useful. Oh yes they do! They allow to add a return value without modifying all the

> Just replace multiple-value-returns with structs, they don't add anything useful. Oh yes they do! They allow to add a return value without modifying all the calling sites. Extremely useful.

sargstuff 4y ago
Algol based languages -> 1st order logic (implicit 'single' return) algol languages array/stack with 'struct' abstract ('struc' abstract converted by compiler to ether parallel array(s) and/or array byte grouping per array ordinal index offset) Lisp languages -> 2nd order logic (implicit nil/1 or many returns) lisp is a tree / heap language where tree node is the 'implied' struct. tree/heap much more flexible than fixed size array of strucs.
dreamcompiler 4y ago
They also don't cons. Structs do.
- sargstuff 4y ago
  lisp -> 1-n; s-expression 1st element ins () is the "memory index" structs -> n * M; "m-expression" 1st element outside of () is the "memory index". cons struc vs. cons lisp () is apples/oranages comparison. if convert both the 'cons struc' and the cons lisp () to same byte vector/stack or equivalent byte tree/heap, then yes, both 'cons' functions are equivalent. higher order equivalent of mealy state machine vs. moore state machine. [1] side note: ( 1 - n ) vs (n * m) is context reference to ploting base 2 log(x). (1 - n ) can never exceed 1. N * M, relative to (1 - n) is unbounded. ===== [1] : https://www.geeksforgeeks.org/difference-between-mealy-machine-and-moore-machine/ https://www.geeksforgeeks.org/difference-between-mealy-machi...
- sargstuff 4y ago
  Wrapping the multivalue return using decorators / generators would provide the 'struct' equivalent without rewriting to 'single' struct. lisp approach to dectorators / generators disucssion. https://stackoverflow.com/questions/32956033/is-there-a-straightforward-lisp-equivalent-of-pythons-generators https://stackoverflow.com/questions/32956033/is-there-a-stra...

> Just replace multiple-value-returns with structs, they don't add anything useful. Oh yes they do! They allow to add a return value without modifying all the calling sites. Extremely useful.

sargstuff 4y ago

Algol based languages -> 1st order logic (implicit 'single' return) algol languages array/stack with 'struct' abstract ('struc' abstract converted by compiler to ether parallel array(s) and/or array byte grouping per array ordinal index offset) Lisp languages -> 2nd order logic (implicit nil/1 or many returns) lisp is a tree / heap language where tree node is the 'implied' struct. tree/heap much more flexible than fixed size array of strucs.

dreamcompiler 4y ago

They also don't cons. Structs do.

sargstuff 4y ago
lisp -> 1-n; s-expression 1st element ins () is the "memory index" structs -> n * M; "m-expression" 1st element outside of () is the "memory index". cons struc vs. cons lisp () is apples/oranages comparison. if convert both the 'cons struc' and the cons lisp () to same byte vector/stack or equivalent byte tree/heap, then yes, both 'cons' functions are equivalent. higher order equivalent of mealy state machine vs. moore state machine. [1] side note: ( 1 - n ) vs (n * m) is context reference to ploting base 2 log(x). (1 - n ) can never exceed 1. N * M, relative to (1 - n) is unbounded. ===== [1] : https://www.geeksforgeeks.org/difference-between-mealy-machine-and-moore-machine/ https://www.geeksforgeeks.org/difference-between-mealy-machi...
sargstuff 4y ago
Wrapping the multivalue return using decorators / generators would provide the 'struct' equivalent without rewriting to 'single' struct. lisp approach to dectorators / generators disucssion. https://stackoverflow.com/questions/32956033/is-there-a-straightforward-lisp-equivalent-of-pythons-generators https://stackoverflow.com/questions/32956033/is-there-a-stra...