How would you call a function that returns all pos...

# stdlib

[mg6maciej]

How would you call a function that returns all possible sublists of a list?
e.g. for listOf(A, B) => listOf(emptyList(), listOf(A), listOf(B), listOf(A, B))

[voddan]

It is "permutations" or "combinations", and traditionally they are used on indices, then applied to a list with `list.slice(perm)

[voddan]

See how it is done in python

[mg6maciej]

Permutation means arranging all elements, like listOf(B, A), listOf(A, B))
Combination is a bit closer, but I always think of it as selecting k elements from n-set, like lotto. Maybe this term can be used more broadly to name all k-combinations, where k is 0 to set size.

[voddan]

or, I see

[voddan]

you wanted sublists of all lengths

[voddan]

sorry I didn't read it right

[voddan]

in math it is called "2^N". It is used as an operator similar to C_n^k

[miha-x64]

Um… allSublistsOf(List)? 🙃

[masted]

2^S is only a notation in a case where S set is finite set, because |P(S)| = 2^n 🙂 actually, in math, it's called power set > #random

[mg6maciej]

@masted Thanks. I never heard of power set, but this is exactly what it is.