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Nov 10, 2025
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Add null to iff #461

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18 changes: 13 additions & 5 deletions apl/scalar-functions/conditional-function.mdx
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Expand Up @@ -9,10 +9,10 @@ keywords: ['axiom documentation', 'documentation', 'axiom', 'case', 'iff']

| **Function Name** | **Description** |
| ----------------- | ------------------------------------------------------------------------------------------------- |
| [case()](#case) | Evaluates a list of conditions and returns the first result expression whose condition is satisfied. |
| [iff()](#iff) | Evaluates the first argument (the predicate), and returns the value of either the second or third arguments |
| [case](#case) | Evaluates a list of conditions and returns the first result expression whose condition is satisfied. |
| [iff](#iff) | Evaluates the first argument (the predicate), and returns the value of either the second or third arguments |

## case()
## case

Evaluates a list of conditions and returns the first result whose condition is satisfied.

Expand Down Expand Up @@ -49,7 +49,7 @@ extend status_human_readable = case(

[Run in Playground](https://play.axiom.co/axiom-play-qf1k/query?initForm=%7B%22apl%22%3A%22%5B'sample-http-logs'%5D%5Cn%7C%20extend%20status_code%20%3D%20case(status_int%20%3D%3D%20200%2C%20'OK'%2C%20status_int%20%3D%3D%20201%2C%20'Created'%2C%20status_int%20%3D%3D%20301%2C%20'Moved%20Permanently'%2C%20status_int%20%3D%3D%20500%2C%20'Internal%20Server%20Error'%2C%20'Other')%22%7D)

## iff()
## iff

Evaluates the first argument (the predicate), and returns the value of either the second or third arguments. The second and third arguments must be of the same type.

Expand All @@ -76,4 +76,12 @@ iff(predicate, ifTrue, ifFalse)
| project Status = iff(req_duration_ms == 1, "numeric", "Inactive")
```

[Run in Playground](https://play.axiom.co/axiom-play-qf1k/query?initForm=%7B%22apl%22%3A%22%5B'sample-http-logs'%5D%5Cn%7C%20project%20Status%20%3D%20iff%28req_duration_ms%20%3D%3D%201%2C%20%5C%22numeric%5C%22%2C%20%5C%22Inactive%5C%22%29%22%7D)
[Run in Playground](https://play.axiom.co/axiom-play-qf1k/query?initForm=%7B%22apl%22%3A%22%5B'sample-http-logs'%5D%5Cn%7C%20project%20Status%20%3D%20iff%28req_duration_ms%20%3D%3D%201%2C%20%5C%22numeric%5C%22%2C%20%5C%22Inactive%5C%22%29%22%7D)

<Note>
To return a null value from `iff`, use `dynamic(null)`.

```kusto
iff(condition, dynamic(null), value)
```
</Note>