Null values in Lists

I have a LIST of data, that may not have values in all fields, eg

1
3
null
5
6
null
7

I only want to use the fields that have data in. But I can't seem to reference the `null` fields so that I can accurately avoid using them. For example, this does not work



Any ideas on how to accurately gauge which fields are empty so i can ignore them? Reordering the list in any way is not a possibility.

I ran into this also.  Interested in the solution.

-Jason

Does it work with the "__ as text" block?

Are you in 3.0? Haxe has a special "null" type for this I believe...

http://haxe.org/ref/syntax

Notice that null has a special value, since any value can be null.

but it behaves differently depending on circumstances:
http://haxe.org/manual/basic_types

Does it work with the "__ as text" block?

Sadly not, worth a try though.

Are you in 3.0? Haxe has a special "null" type for this I believe...

http://haxe.org/ref/syntax

Notice that null has a special value, since any value can be null.

but it behaves differently depending on circumstances:
http://haxe.org/manual/basic_types

I am in 3.0 but my Haxe skills = 0.

Umm, FYI, your example would not work. Lists start at an index of 0, so the "item 3" is actually the 5 from the list.

I personally use 0's for null values and have never had issues with them... *shrugs*

Gruffman, your example is close. Just enclose "null" in a code block. As it is, Stencyl will think that you're comparing against the string "null" rather than the null value.

I have a similar question, and I'd rather not post my very own topic for what seems like it may be the same solution.

I'm using a list for a dialogue system that pulls 4 lines of text at a time from a list and types out what that item says. However if one of those lines does not havea  value it returns as "UNDEFINED" and prints that.

What I'm trying to figure out is if there is some way to check if the current item in a list has no value so I can tell my text typer not to display text if no value = true. Sounds simple enough but I can't for the life of me figure it out.

Thanks!

Jubiloo, assuming you're using 2.2, I think that in your case it will be a little more difficult, because of the specific way that equality is checked in the flash engine.

Stencyl uses Script.sameAs() to check for equality, which immediately returns false if either of the values is null or undefined. Instead you could try the following in a code block:

Code: [Select]

_YourArrayName[0] != null
If you use that as the boolean in your if statement, it will only pass through if the first element (index 0) of "Your Array Name" is defined.



Actually... upon second thought, you could just compare the value against itself. If Stencyl equality check returns false, then at least one of the values must have been null.

Code: [Select]

if <[get item # [0] from [Your List] = [get item # [0] from [Your List]>
- ...