github.com/rstandt/terraform@v0.12.32-0.20230710220336-b1063613405c/website/docs/configuration/functions/tolist.html.md (about)

     1  ---
     2  layout: "functions"
     3  page_title: "tolist - Functions - Configuration Language"
     4  sidebar_current: "docs-funcs-conversion-tolist"
     5  description: |-
     6    The tolist function converts a value to a list.
     7  ---
     8  
     9  # `tolist` Function
    10  
    11  -> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
    12  earlier, see
    13  [0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
    14  
    15  `tolist` converts its argument to a list value.
    16  
    17  Explicit type conversions are rarely necessary in Terraform because it will
    18  convert types automatically where required. Use the explicit type conversion
    19  functions only to normalize types returned in module outputs.
    20  
    21  Pass a _set_ value to `tolist` to convert it to a list. Since set elements are
    22  not ordered, the resulting list will have an undefined order that will be
    23  consistent within a particular run of Terraform.
    24  
    25  ## Examples
    26  
    27  ```
    28  > tolist(["a", "b", "c"])
    29  [
    30    "a",
    31    "b",
    32    "c",
    33  ]
    34  ```
    35  
    36  Since Terraform's concept of a list requires all of the elements to be of the
    37  same type, mixed-typed elements will be converted to the most general type:
    38  
    39  ```
    40  > tolist(["a", "b", 3])
    41  [
    42    "a",
    43    "b",
    44    "3",
    45  ]
    46  ```