isa(eltype(X), T) versus iseltype(X, T)

[Júlio Hoffimann]

Hi,

Someone could please explain the difference?

julia> iseltype(Array(Int,1), Integer)

true

julia> isa(eltype(Array(Int,1)),Integer)

false

Thanks,

Júlio.

[Mauro]

Consider

julia> eltype(Array(Int,1))<:Integer
true

julia> isa(5, Number)
true

julia> isa(Int, Number)
false

julia> isa(Int, DataType)
true

isa tests whether something is an instance of a type. As Int is not an
instance of Integer but a subtype isa(Int,Integer)==false.

[Júlio Hoffimann]

Thank you Mauro.

-Júlio