1[1:1] should work

[StefanKarpinski]

Reported here: https://discourse.julialang.org/t/indexing-a-number/88735. My reasoning is that fill(1)[1:1] works so 1[1:1] should produce the same thing:

julia> fill(1)[1:1]
1-element Vector{Int64}:
 1

julia> 1[1:1]
ERROR: MethodError: no method matching getindex(::Int64, ::UnitRange{Int64})

[bkamins]

But also you have:

julia> fill(1)[[1,1,1,1]]
4-element Vector{Int64}:
 1
 1
 1
 1

and this works because fill(1) is AbstractArray, while 1 is not AbstractArray.

Note that we have the following difference in the documentation:

getindex(collection, key...)

Retrieve the value(s) stored at the given key or index within a collection.

vs

getindex(A, inds...)

Return a subset of array A as specified by inds, where each ind may be, for example, an Int, an AbstractRange, or a Vector. See the manual section on array indexing for details.

So the documentation is explicit that getindex works differently for collections and for AbstractArrays.

[StefanKarpinski]

Ah, I see. The indexing with an array of indices behavior is specifically for arrays, not arbitrary collections (and for better or worse 1 is a kind of collection but not an array).

[adienes]

janitorial closing as it seems to be intended behavior, but please reopen if you still want this