Any idea to make the best code for combination :
with this :
letters := []string{"a", "b", "c", "d"}
to have : a ab ac ad abc abd b bc bcd etc ...
regards and thanks
You are looking for Powerset:
One approach is:
Start with a slice with one empty element, let's call it result:
[[]]
Keep the previous slice, and create a new slice with first element a of you data structure added to you to every element in you original slice.
[[]] <--old; [[a]] <--new
merge them
[[], [a]]
Do the same thing for second element b:
[[], [a]] <--old; [[b], [ab]] <--new
=> [[], [a], [b], [ab]]
for c:
[[], [a], [b], [ab]] <--old; [[c], [ac], [bc], [abc]] <--new
=> [[], [a], [b], [ab], [c], [ac], [bc], [abc]]
and so on..