Hi all, I’m looking for a way to pass… nothing! My script has some part that may or may not calculate rebar and pass it on to the “Rebar.ByCurve” node. If my script doesn’t get a value from excel I want to use an if statement that returns a standard value so I don’t get yellow errors. Or if there…

I think this should help [image] List.ReplaceItemAtIndex (sometimes index input is an Empty List) Hello all, I started writing this post when I had an idea and it worked but I am wondering if there is a better way. I am writing a script to find what sheets legend views…

Hi @erfajo , when I pass a string like “dummy” to the inputs “curve” and “vector” from the node “rebar.bycurves” i will get an error that the input is not what the node is expecting. I want to run my script in the Dynamo player so colleagues who don’t know about Dynamo can still use the scripts. Bu…

If you look in the link in my link it uses a code block and the node as a function. I think that will work.

Hi @Steven , you mean the .gif file that has the 2 ranges 0…5 and 0…10. I’ve seen it but I don’t know if that is what I need. Because that function is still passing on data. And it isn’t setting an other node into a function mode. And to be honnest my knowledge of Dynamo is still to limited to se…

[image] erfajo: Your initial question was about passing null values, and that is not recommendable. I can certainly second this. never move a null/empty i you don’t have to and you certainly don’t have to here. Instead try looking into creating some functions from the two possible routes and…

Yes I was talking about the gif. The first code block is running a list count is greater than X function. This produces a true or false depending on list length. You can use anything that produces a true or false (figure out what works best for you). The second code block is where the magic is happ…

Nulls and Empty lists can be frustrating. Unfortunately in many ways it’s a limitation of data types, not just a limitation of Dynamo. One example: computers (and life in general) can’t really perform mathematical operations on a string: 4 * “A” = It makes no sense! There is no easy rationalized a…

@jacob.small I understand that in some cases a null or an empty list is a mistake but in many it’s not. In my example link I posted I was trying to replace Items at various indices if a particular event had taken place. If this event does not exists an empty list is returned for indices that need t…

[TI85_graphing_calculator] Smart alecking aside, these are all very good points in how languages are designed with nulls in mind. I think the difference in DesignScript vs another language that you pointed out like Python, is exception handling. So when nulls are thrown into the script, either by …

@kennyb6 - That pic just made my night! [image] kennyb6: Python can handle it but Dynamo still doesn’t have a very intuitive way yet, besides knowing more in-depth DS. If you ask me, Python doesn’t really handle null any better than Dynamo or most other laungauges do natively - they both jus…

Looking for a way to pass nothing

DesignScript

Steven February 16, 2018, 4:40pm 2

I think this should help

Topic		Replies	Views
Sort of "on/off" switch needed Lists-Logic	16	8608	December 27, 2019
Codeblock for loops with nodes DesignScript	36	7521	September 5, 2018
DesignScript Novice - What am I missing here? DesignScript revit , function	30	2656	September 30, 2021
Values placed, Preview displaying null DesignScript revit , dynamo , mathematica	11	72	January 21, 2025
Stop running a branch of script if list is empty Revit dynamo	6	5418	March 19, 2019

Looking for a way to pass nothing

Related topics