Rearrange at indices builtin

[chunkybanana]

Something like (list, function, indices) ->

newvals = function(map(lambda a:list[a], indices))
for i in range(len(indices)):
  list[indices[i]] = newvals[i]

[cgccuser]

APL has @ which is kinda like this

[zoomlogo]

I think Jelly has something similar.

[razetime]

this fits a generalized primitive, which is apply at indices, which fits another generalized primitive which is called Under. apply at indices seems like a decent fit for golfing.

[lyxal]

¨M already does something like this.

[chunkybanana]

¨M already does something like this.

No it really doesn't.

[lyxal]

What type is indices? Also,

map(indices,lambda a:list[a])

isn't how map works. It takes lambda then iterable.

[lyxal]

And if you had to give a one line description of what this does, what would it be?

@chunkybanana for this and the above.

[chunkybanana]

Indices is an integer list, I guess? I'm bad at python.

"Call a function on all elements at specified indices together and put that back in the list"?

BTW, this should be 1 byte because it's a function element and we have the space.

[lyxal]

Of course, it's going to be an overload of ¢