Wish List contains

If myList.indexOf("someValue") <> -1 then ...

If myList.contains("someValue") then ...

    Dim item1 As Map = CreateMap("a": 1)
    Dim item2 As Map = CreateMap("a": 2)
    
    Dim myList As List
    myList.Initialize
    myList.Add(item1)
    myList.Add(item2)
    
    Dim item3 As Map = CreateMap("a": 1)
    Dim item4 As Map = CreateMap("a": 2)
    
    Log(myList.IndexOf(item1) <> -1)    'true
    Log(myList.IndexOf(item2) <> -1)    'true
    Log(myList.IndexOf(item3) <> -1)    'false
    Log(myList.IndexOf(item4) <> -1)    'false

    Log(item3)                            '{a=1}
    Log(myList)                           '[{a=1}, {a=2}]
    Log(myList.IndexOf(item3) <> -1)                ' I expect myList contains {a=1} and returns true but it returns false
    Log(myList.IndexOf(CreateMap("a": 1)) <> -1)    ' same as above

Type Member (name As String, age As Int)

Public Sub CreateMember (name As String, age As Int) As Member
    Dim t1 As Member
    t1.Initialize
    t1.name = name
    t1.age = age
    Return t1
End Sub

Dim Members As List
Members.Initialize
Members.Add(CreateMember("aeric", 21))
Members.Add(CreateMember("mario", 18))

Dim Person As Member
Person.Initialize
Person.name = "aeric"
Person.age = 21

Log("index=" & Members.IndexOf(Person))