Efficient way to split string at specific index

[DNF]

@Sukera

Returning a String would break that contract, as well as force an allocation for each individual String, since they are immutable objects.

I should have said SubString.

@Sukera

It’s because String is an iterable object over individual Char, and Iterators.partition partitions an iterable into sections of its eltype.

Since you have this:

julia> collect(Iterators.partition(1:5, 2))
3-element Vector{UnitRange{Int64}}:
 1:2
 3:4
 5:5

and

julia> collect(Iterators.partition([1,2,3,4,5], 2))
  3-element Vector{SubArray{Int64, 1, Vector{Int64}, Tuple{UnitRange{Int64}}, true}}:
   [1, 2]
   [3, 4]
   [5]

why can’t a partition over String return a Substring? A SubString is to a String as a SubArray is to an Array, isn’t it?

The docstring of partition just says

Iterate over a collection n elements at a time.

which is vague enough as far as I can tell.