docs: uppercase ex with substring (#5056)

brimdata · Mar 14, 2024 · f1be6a4 · f1be6a4
1 parent 38763f8
commit f1be6a4
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/docs/language/functions/upper.md b/docs/language/functions/upper.md
@@ -22,3 +22,13 @@ echo '"Zed"' | zq -z 'yield upper(this)' -
 ```mdtest-output
 "ZED"
 ```
+
+[Slices](../expressions.md#slices) can be used to uppercase a subset of a string as well.
+
+```mdtest-command
+echo '"zed"' | zq -z 'func upper_first_char(str): (upper(str[0:1]) + str[1:]) yield upper_first_char(this)' -
+```
+=>
+```mdtest-output
+"Zed"
+```