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chore(KNO-12088): Clarify how empty / not empty treats missing values #1352

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scotidodson merged 1 commit into from
Mar 16, 2026
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chore(KNO-12088): Clarify how empty / not empty treats missing values #1352

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38 changes: 19 additions & 19 deletions content/concepts/conditions.mdx
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Expand Up @@ -137,25 +137,25 @@ The timestamp operators (`is_timestamp_before`, `is_timestamp_on_or_after`, and

You can use any of the following operators in condition comparisons:

| Operator | Description |
| -------------------------- | ---------------------------------------------------------------------------------------- |
| `equal_to` | `==` |
| `not_equal_to` | `!=` |
| `greater_than` | `>` |
| `greater_than_or_equal_to` | `>=` |
| `less_than` | `<` |
| `less_than_or_equal_to` | `<=` |
| `contains` | Checks whether `argument` is in `variable` (works with strings and lists) |
| `contains_all` | Checks whether all `argument` values are present in `variable` (for comparing lists) |
| `not_contains` | Checks whether `argument` is not in `variable` (works with strings and lists) |
| `not_contains_all` | Checks whether all `argument` values are not present in `variable` (for comparing lists) |
| `empty` | Checks whether `variable` is in `["", null, []]` |
| `not_empty` | Checks whether `variable` is not in `["", null, []]` |
| `exists` | Checks whether `variable` is provided and has a value that is not `null` |
| `not_exists` | Checks whether `variable` is not provided or has a `null` value |
| `is_timestamp_before` | Checks whether `variable` is a timestamp before the `argument` value |
| `is_timestamp_on_or_after` | Checks whether `variable` is a timestamp on or after the `argument` value |
| `is_timestamp_between` | Checks whether `variable` is a timestamp between the `argument`'s start and end values |
| Operator | Description |
| -------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- |
| `equal_to` | `==` |
| `not_equal_to` | `!=` |
| `greater_than` | `>` |
| `greater_than_or_equal_to` | `>=` |
| `less_than` | `<` |
| `less_than_or_equal_to` | `<=` |
| `contains` | Checks whether `argument` is in `variable` (works with strings and lists) |
| `contains_all` | Checks whether all `argument` values are present in `variable` (for comparing lists) |
| `not_contains` | Checks whether `argument` is not in `variable` (works with strings and lists) |
| `not_contains_all` | Checks whether all `argument` values are not present in `variable` (for comparing lists) |
| `empty` | Checks whether `variable` is in `["", null, []]`. If the variable is not provided at the path, Knock treats it as empty, so this returns true. |
| `not_empty` | Checks whether `variable` is not in `["", null, []]`. If the variable is not provided at the path, Knock treats it as empty, so this returns false. |
| `exists` | Checks whether `variable` is provided and has a value that is not `null` |
| `not_exists` | Checks whether `variable` is not provided or has a `null` value |
| `is_timestamp_before` | Checks whether `variable` is a timestamp before the `argument` value |
| `is_timestamp_on_or_after` | Checks whether `variable` is a timestamp on or after the `argument` value |
| `is_timestamp_between` | Checks whether `variable` is a timestamp between the `argument`'s start and end values |

<Callout
type="info"
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