Arthur Whitney has released an open-source version of k! shakti.com/k

If you need to shift a list right, 0 :': will do it (right-each-prior). Replace zero with your seed of choice.

You can also use -1_0, . Do it in that order rather than 0,-1_ to ensure it works for empty lists.

K is described as 'left of right' because we read 'f x' like in math: 'f of x'.

Some of ktye's cool k projects:

ktye.github.io/kweb/

ktye.github.io/halfkey/

ktye.github.io/pdp11/index....

ktye.github.io/kweb/compile...

And of course, the zoo:

ktye.github.io/zoo/index.ht...

Trying k online:

ngn.codeberg.page/k/

johnearnest.github.io/ok/index.html

johnearnest.github.io/ok/ike/ike.h...

ktye.github.io/zoo/

repl.club

Learning k:

k.miraheze.org/wiki/Learnin...

xpqz.github.io/kbook/Introd...

What I used, years ago:

github.com/JohnEarnest/...

github.com/JohnEarnest/...

Past k articles:

WAR ON RAZE gist.github.com/chrispsn/af6...

We need to talk about group. gist.github.com/chrispsn/345...

K: default dicts? gist.github.com/chrispsn/ff0...

k chats:

matrix.to#/#aplfarm-k:... (all dialects)

matrix.to#/#ngnk:matri... (ngn/k)

matrix.to#/#aplfarm:ma... (array langs)

chat.stackexchange.com/rooms/90748/... (dead; great archives)

chat.stackexchange.com/rooms/52405/... (pre-k tree)

github.com/dzaima/chatl... (logs of k tree, APL Orchard)

Flat ranges (f 3 2 => 0 1 2 0 1), same as ,/!':

{(!*|+/x)-&(0:':+\x)!x}

Or if you have an occurrence count primitive:

oc:{i-(i:<<x)x?x}
oc@&:

Reverse flat ranges (f 3 2 => 2 1 0 1 0), same as ,/|'!':

{(&a!x)-1+!*|a:+\x}