github.com/Ilhicas/nomad@v1.0.4-0.20210304152020-e86851182bc3/website/content/docs/job-specification/hcl2/functions/collection/index-fn.mdx (about)

     1  ---
     2  layout: docs
     3  page_title: index - Functions - Configuration Language
     4  sidebar_title: index
     5  description: The index function finds the element index for a given value in a list.
     6  ---
     7  
     8  # `index` Function
     9  
    10  `index` finds the element index for a given value in a list.
    11  
    12  ```hcl
    13  index(list, value)
    14  ```
    15  
    16  The returned index is zero-based. This function produces an error if the given
    17  value is not present in the list.
    18  
    19  ## Examples
    20  
    21  ```shell-session
    22  > index(["a", "b", "c"], "b")
    23  1
    24  ```
    25  
    26  ## Related Functions
    27  
    28  - [`element`](/docs/job-specification/hcl2/functions/collection/element) retrieves a particular element from a list given
    29    its index.