B4J Question Sorting list where items start with an integer

kostefar · May 4, 2018

Dear All,

The result of:

B4X:

Dim l As List
l.Initialize

l.Add("77 a")
l.Add("88 a")
l.Add("880 a")
l.Add("777 a")
l.Sort(True)
For i = 0 To l.Size - 1
  
    Log (l.Get(i))
Next

.. is

B4X:

and I want it to be

B4X:

It works if I don´t add the numbers as text, but in this case I need to have some text showing in each list item after the number.
Any hints?

Thanks in advance!

LucaMs · May 4, 2018

Add zeroes ("0") on the left, to have all items with the same lenght.

When you must show them, you can remove the useless zeroes.

[I remember that many "0" must be write "zeroes"; is this correct? ]

kostefar · May 4, 2018

LucaMs said:
Add zeroes ("0") on the left, to have all items with the same lenght.

When you must show them, you can remove the useless zeroes.

[I remember that many "0" must be write "zeroes"; is this correct? ]

I think I get you, so padding 0´s .. if largest number expected is 1000, then you´d add 3 zeros to anything below 10, 2 to anything below 100 etc?

EDIT: Yup, did the trick:

B4X:

If pct < 10 Then pctstring = "000" & pct
                    If pct > 10 And pct < 100 Then pctstring = "00" & pct
                    If pct > 100 And pct < 1000 Then pctstring = "0" & pct
            ranklist.Add (pctstring & "   " & coin)

And afterwards

B4X:

Dim rankitem As String = ranklist.get(i)
    If rankitem.StartsWith("000") Then rankitem = rankitem.SubString(3)
            If rankitem.StartsWith("00") Then rankitem = rankitem.SubString(2)
            If rankitem.StartsWith("0") Then rankitem = rankitem.SubString(1)
            Log ("# " & i & " " & rankitem)

LucaMs · May 4, 2018

LucaMs said:
[I remember that many "0" must be write "zeroes"; is this correct? ]

You can use both; since I'm old, I will use "zeroes"

LucaMs · May 4, 2018

kostefar said:
I think I get you, so padding 0´s .. if largest number expected is 1000, then you´d add 3 zeros to anything below 10, 2 to anything below 100 etc?

Yes

LucaMs · May 4, 2018

It is like "right alignment" of a text but not in a string with spaces, with zeroes.

udg · May 4, 2018

Have a look at the List's SortType method

LucaMs · May 4, 2018

udg said:
Have a look at the List's SortType method

Io si, conosco. Molto utile.

I know. Very useful.

kostefar · May 4, 2018

udg said:
Have a look at the List's SortType method

Wow, that´s a nice approach indeed. Came across sort-type before but didnt look into it. Very elegant!

Thanks!

B4J Question Sorting list where items start with an integer

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