B4J Question B4J - Simple Question - Number of Objects

[AlexOfOz]

I'm sure there must be a simple way to do this, but I haven't got a clue.

I have many buttons of the same type, that I am managing with an array. How can I determine how many buttons I have, so I can include that in my DO loops?

In other words, how do I find the missing number -

For i = 0 to ??? <---- missing number

Thanks.

 

[EnriqueGonzalez]

If you are using array ??

Dim arr(5) as button

Then use

Arr.length without parentheses

 

[AlexOfOz]

Arr.length - Excellent. Thank-you very much.

I knew there would be a way; I just didn't know what it was.

Much appreciated

 

[Erel]

Tips:
1. Prefer lists of arrays.
2. Prefer For Each over For i:

For Each btn As B4XView In MyButtons
 ...
Next

 

[AlexOfOz]

Thank-you Erel, I will try FOR EACH instead.

The root of my question was answered with ARR.LENGTH. I expected there would be a way, just like the LENGTH parm for a string, but it never occurred to me that it could be so straight forward.

I am now using this method throughout my program and it is working beautifully.

 

[amorosik]

Tips:
1. Prefer lists of arrays.
2. Prefer For Each over For i:

For Each btn As B4XView In MyButtons
...
Next

Why For Each is preferable way vs For i ?

 

[Erel]

It is preferable when you don't need the index.
1. It is safer as you can't get the first or last index wrong:

For i = 1 To Arr.Length 'both of them are wrong here
 Dim btn As B4XView = Arr(btn)
 ...
Next

2. It is shorter and more clear:

For Each btn As B4XView In Arr

Next