1.2 KiB
1.2 KiB
| layout | page_title | sidebar_current | description |
|---|---|---|---|
| language | element - Functions - Configuration Language | docs-funcs-collection-element | The element function retrieves a single element from a list. |
element Function
element retrieves a single element from a list.
element(list, index)
The index is zero-based. This function produces an error if used with an 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.
Examples
> element(["a", "b", "c"], 1)
b
If the given index is greater than the length of the list then the index is "wrapped around" by taking the index modulo the length of the list:
> element(["a", "b", "c"], 3)
a
To get the last element from the list use length 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