Concatenative Programming

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Hello!

This space is for sharing news, experiences, announcements, questions, showcases, etc. regarding concatenative programming concepts and tools.

We'll also take any programming described as:

pipelined
stack-oriented
tacit
postfix / reverse Polish notation (RPN)

From Wikipedia:

A concatenative programming language is a point-free computer programming language in which all expressions denote functions, and the juxtaposition of expressions denotes function composition. Concatenative programming replaces function application, which is common in other programming styles, with function composition as the default way to build subroutines.

For example, a sequence of operations in an applicative language like the following:

y = foo(x)
z = bar(y)
w = baz(z)

...is written in a concatenative language as a sequence of functions:

x foo bar baz

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founded 1 year ago

MODERATORS

Ategon

Andy

remokasu/stacker: command-line RPN calculator with an RPN-based scripting language (on PyPI) (github.com)

submitted 1 month ago by Andy to c/concatenative

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[–] pkill 1 points 1 month ago (5 children)

how does that compare to Hy besides being more domain specific and the order of operations (prefix vs suffix notation)?

[–] Andy 1 points 1 month ago (4 children)

I've never used Hy. Does it offer any concatenative-style interaction?

[–] pkill 2 points 1 month ago (3 children)

it's uses standard lispy operator-operands order see https://learnxinyminutes.com/docs/hy

[–] Andy 1 points 1 month ago (1 children)

So it looks like a totally different data flow style, and (I think) geared toward writing then running programs, whereas Stacker is more for interactive stack-oriented calculator tasks.

[–] pkill 1 points 1 month ago (1 children)

lisps are very repl-driven too

[–] Andy 1 points 1 month ago

I'd say an important part of this calculator's interaction model is doing something, getting a result, then doing something else to that result. That's not too bad in the regular Python interpreter either.

For example, in Python:

>>> 5
5
>>> 4 + _
9
>>> 2 * _
18

In Stacker:

>>> 5
[5]
>>> 4 +
[9]
>>> 2 *
[18]

Does Hy have something like the Python interpreter's _?

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