It’s not the closest to your example, but i guess most idiomatic in julia.
julia> "a" .* lpad.(1:10, 2, '0')
10-element Vector{String}:
"a01"
"a02"
"a03"
"a04"
"a05"
"a06"
"a07"
"a08"
"a09"
"a10"
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