# FSharpPlus Traversable In FSharpPlus, a traversable must have the following members: ```fsharp static member Traverse ( t :'Traversable<'T>, f : 'T->'Functor<'U>) : 'Functor<'Traversable<'U>> static member Sequence ( t :'Traversable<'Functor<'T>>) : 'Functor<'Traversable<'T>> ``` Note that `Sequence` is nothing other than `Traverse` called with `id`.