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

* 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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Nick Fagerlund 2020-10-30 17:43:35 -07:00 committed by GitHub
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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
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
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
```
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
* [`index`](./index.html) finds the index for a particular element value.