How to prevent the arrowhead anti-pattern

Question

I\'m a bit confused about how to best refactor my code into something more readable.

Consider this piece of code:

var foo = getfoo();
if(foo!=null)
{         


        

Answer 1

Strange, nobody mentioned method chaining.

If you create once a method chaining class

Public Class Chainer(Of R)

    Public ReadOnly Result As R

    Private Sub New(Result As R)
        Me.Result = Result
    End Sub

    Public Shared Function Create() As Chainer(Of R)
        Return New Chainer(Of R)(Nothing)
    End Function

    Public Function Chain(Of S)(Method As Func(Of S)) As Chainer(Of S)
        Return New Chainer(Of S)(Method())
    End Function

    Public Function Chain(Of S)(Method As Func(Of R, S)) As Chainer(Of S)
        Return New Chainer(Of S)(If(Result Is Nothing, Nothing, Method(Result)))
    End Function
End Class

You can use it everywhere to compose any number of functions into an execution sequence to produce a Result or a Nothing (Null)

Dim Cow = Chainer(Of Object).Create.
    Chain(Function() GetFoo()).
    Chain(Function(Foo) GetBar(Foo)).
    Chain(Function(Bar) GetMoo(Bar)).
    Chain(Function(Moo) GetCow(Moo)).
    Result