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website: Index for element must be a non-negative integer (#26679)

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* The index must be non-negative integer

and added instructions on how to get the last value in the list.

* Typo fix

Co-authored-by: Nick Fagerlund <nick@hashicorp.com>
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website/docs/configuration/functions/element.html.md
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@ -19,7 +19,7 @@ element(list, index)
``` ```
The index is zero-based. This function produces an error if used with an The index is zero-based. This function produces an error if used with an
empty list. empty list. The index must be a non-negative integer.
Use the built-in index syntax `list[index]` in most cases. Use this function Use the built-in index syntax `list[index]` in most cases. Use this function
only for the special additional "wrap-around" behavior described below. only for the special additional "wrap-around" behavior described below.
@ -39,6 +39,15 @@ If the given index is greater than the length of the list then the index is
a a
``` ```
To get the last element from the list use [`length`](./length.html) to find
the size of the list (minus 1 as the list is zero-based) and then pick the
last element:
```
> element(["a", "b", "c"], length(["a", "b", "c"])-1)
c
```
## Related Functions ## Related Functions
* [`index`](./index.html) finds the index for a particular element value. * [`index`](./index.html) finds the index for a particular element value.