New feature - inline casting

Erel

Erel

B4X founder
Staff member
Licensed User
Longtime User
Code: 
Dim Buttons As List = Array(Button1, Button2, Button3, Button4, Button5)
Dim btn As B4XView = Buttons.Get(1)
btn.Text = "boring" 

Buttons.Get As B4XView(2).Text = "less boring"
Button5.Text = Buttons.Get As B4XView(2).Text
 Dim m As Map = CreateMap("ttt": " 123 ;lkasd  ")
Button4.Text = m.Get As String("ttt").Trim
Root.GetView As WebView(8).LoadURL("https://www.b4x.com") '8 is the view's index
 
Erel said:
'8 is the view's index
Click to expand...
A numbering in the designer would be very useful to find out faster the index of a view, with 20 views this is often exhausting.
0
1
2
___0
___1
___2
3
4
 
Hi @Erel is very interesting.
On which version will it be available ( B4A/B4i/B4J?) ?
Will there be any examples ?
Thank you
 
Great!! Does it also affect non-indexed variables?

Example
B4X: 
Sub TicToc(Ob as object)
     Ob as B4xView.Text = "try"
End sub

B4X: 
if Sub TicTac(Ob as object)
     if Ob as B4xView.Text = "try" then log("ok")
End sub

if Sub TicTec(Ob as String)
     if Ob as int = 12 then log("12")
End sub
 
Last edited:
I know you will have made up your mind and this might not fit your parser easily but I would find it more intuitive as
B4X: 
Dim Buttons As List = Array(Button1, Button2, Button3, Button4, Button5)
Dim btn As B4XView = Buttons.Get(1)
btn.Text = "boring" 

(Buttons.Get(2) As B4XView).Text = "less boring"
Button5.Text =(Buttons.Get(2) As B4XView).Text
 Dim m As Map = CreateMap("ttt": " 123 ;lkasd  ")
Button4.Text = m.Get As String("ttt").Trim
(Root.GetView(8) As WebView).LoadURL("https://www.b4x.com") '8 is the view's index
 
Alexander Stolte said:
A numbering in the designer would be very useful to find out faster the index of a view, with 20 views this is often exhausting.
0
1
2
___0
___1
___2
3
4
Click to expand...

@Erel I would request you to consider @Alexander Stolte request too, if possible. As I too have to count them one by one.
 
Star-Dust said:
Great!! Does it also affect non-indexed variables?
Click to expand...
Currently it can only be added after methods.
Alexander Stolte said:
A numbering in the designer would be very useful to find out faster the index of a view, with 20 views this is often exhausting.
Click to expand...
It isn't really related to this thread but it will be solved in one of the next versions.

MarcoRome said:
On which version will it be available ( B4A/B4i/B4J?) ?
Click to expand...
The next version of each IDE.
 
Erel said:
Code: 
Dim Buttons As List = Array(Button1, Button2, Button3, Button4, Button5)
Dim btn As B4XView = Buttons.Get(1)
btn.Text = "boring"

Buttons.Get As B4XView(2).Text = "less boring"
Button5.Text = Buttons.Get As B4XView(2).Text
Dim m As Map = CreateMap("ttt": " 123 ;lkasd  ")
Button4.Text = m.Get As String("ttt").Trim
Root.GetView As WebView(8).LoadURL("https://www.b4x.com") '8 is the view's index
Click to expand...
Wait, is this B4X version 2.0? ?

What I know is we use “As” when declaring a variable with Public/Private/Dim or when defining the return type of a function.
1. I never know we can declare something As array(x) and directly to it’s property.
2. I think I need a new introduction to .Get and .Get(x) methods.
3. SomeMap.Get As String("xxx").Trim is crazy. What is this type String(“Some Text”)?
4. Root.GetView As WebView(8).LoadURL("http...”)?
Oh no... my brain can’t process anymore!!!
Object.Method As View(i).Method(“xxx”) ?

Now, I am new to B4X. ?
 
Sandman said:
Yeah, I also feel very confused by this new feature.
Click to expand...
I think the feature will make that a little easier and more readable:
B4X: 
xpnl_item_3.GetView(0).Color = BackgroundColor
xpnl_item_3.GetView(1).GetView(0).Text = Text
xpnl_item_3.GetView(1).GetView(1).GetView(0).Text = Amount & "€"
xpnl_item_3.GetView(1).GetView(1).GetView(0).Text = xpnl_item_3.GetView(1).GetView(1).GetView(0).Text.Replace(".",",")
xpnl_item_3.GetView(4).GetView(0).Text = GetItem3Count(CardType) +1
And if I have a customview, I have to declare a variable because otherwise I can't access the properties. And through the feature this is simplified, I think.
 
Personally, I find that the syntax suggested by @agraham is more readable
Code: 
(Buttons.Get(2) As B4XView).Text = "less boring"

But, then, shouldn't it be
Code: 
Dim m As Map = CreateMap("ttt": " 123 ;lkasd  ")
Button4.Text = (m.Get("ttt")As String).Trim

Anyway, I'm sure that once we get used to this new feature we will love it (as it always happened in the past..)
Go B4X, go!
 
udg said:
Personally, I find that the syntax suggested by @agraham is more readable
Click to expand...
Yes, I find it to be a big improvement.

udg said:
But, then, shouldn't it be
Click to expand...
Yep, it should. And that's also a big improvement in my opinion.

udg said:
Anyway, I'm sure that once we get used to this new feature we will love it
Click to expand...
I'm not so sure, I'm really trying to like the syntax that Erel showed, but I'm not feeling it yet.

udg said:
Go B4X, go!
Click to expand...
Agreed! :)
 
is this limited to Views or will this be possible too?

MyClass:
Code: 
Sub Class_Globals
    Public Name As String
End Sub

Public Sub Initialize(mName as String)
    Name = mName
End Sub

Code: 
Dim lst as List
lst.Initialize

for i = 0 to 5
    Dim cls as MyClass
    cls.Initialize("Name" & i)
    lst.Add(cls)
next

for i = 0 to lst.Size - 1
    Log(lst.Get as MyClass(i).Name)
next

My preference would've been:
Code: 
for i = 0 to lst.Size - 1
    Log((MyClass)lst.Get(i).Name)
next

But I also do like @agraham's suggestion a lot!
Code: 
for i = 0 to lst.Size - 1
    Log((lst.Get(i) As MyClass).Name)
next

EDIT: The more I look into Erels implementation, the more I start to like it! It will probably even be the easiest one to parse for e.g. BANano ?, as for JavaScript the Type is irrelevant and can just be ignored anyway:

Code: 
for (var i = 0; i < lst.length; i++)  {
    console.log(lst[i]["Name"]);
}

Alwaysbusy
 
Last edited:
agraham said:
I know you will have made up your mind and this might not fit your parser easily but I would find it more intuitive as
B4X: 
Dim Buttons As List = Array(Button1, Button2, Button3, Button4, Button5)
Dim btn As B4XView = Buttons.Get(1)
btn.Text = "boring"

(Buttons.Get(2) As B4XView).Text = "less boring"
Button5.Text =(Buttons.Get(2) As B4XView).Text
Dim m As Map = CreateMap("ttt": " 123 ;lkasd  ")
Button4.Text = m.Get As String("ttt").Trim
(Root.GetView(8) As WebView).LoadURL("https://www.b4x.com") '8 is the view's index
Click to expand...
It is such a special thing that it would be even better to use square brackets (although typing these is more cumbersome).
B4X: 
[Buttons.Get(2) As B4XView].Text = "less boring"
 
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