Mapping a value from one range to another

General Usage
2

you can decide what the edge case behavior you want, but this should do what you want in case of divisible ranges


julia> function map_range(range1, range2, val)
           slope = length(range2)÷length(range1)
           return range2[findfirst(==(val), range1) * slope]
       end
map_range (generic function with 1 method)

julia> map_range(1:10, 1:100, 6)
60

julia> map_range(1:10, 1:100, 5)
50

julia> map_range(1:20, 1:100, 5)
25

julia> map_range(1:20, 1:100, 10)
50