How to get the maximum and minimum values of a given type

Question

How does one get the maximum and minimum values of a Number type like an Integer or a Float?

max_value(Int)

Answer 1

For questions like this, you will be best served by looking at the julia docs https://docs.julialang.org/en/v1/base/base/#Base.typemin

Specifically for this question, typemin(Int), and typemax(Int) should do what you want.

Answer 2

But typemax(Float64) gives 'Inf' which is probably not what the author wanted. The trick is to use prevfloat(typemax(Float64)) which is not that obvious.

julia> typemax(Float64)
Inf
julia> prevfloat(typemax(Float64))
1.7976931348623157e308