| --- |
| page_title: merge - Functions - Configuration Language |
| description: |- |
| The merge function takes an arbitrary number maps or objects, and returns a |
| single map or object that contains a merged set of elements from all |
| arguments. |
| --- |
| |
| # `merge` Function |
| |
| `merge` takes an arbitrary number of maps or objects, and returns a single map |
| or object that contains a merged set of elements from all arguments. |
| |
| If more than one given map or object defines the same key or attribute, then |
| the one that is later in the argument sequence takes precedence. If the |
| argument types do not match, the resulting type will be an object matching the |
| type structure of the attributes after the merging rules have been applied. |
| |
| ## Examples |
| |
| ``` |
| > merge({a="b", c="d"}, {e="f", c="z"}) |
| { |
| "a" = "b" |
| "c" = "z" |
| "e" = "f" |
| } |
| ``` |
| |
| ``` |
| > merge({a="b"}, {a=[1,2], c="z"}, {d=3}) |
| { |
| "a" = [ |
| 1, |
| 2, |
| ] |
| "c" = "z" |
| "d" = 3 |
| } |
| ``` |
| |
| The following example uses the expansion symbol (...) to transform the value into separate arguments. Refer to [Expanding Function Argument](/terraform/language/expressions/function-calls#expanding-function-arguments) for details. |
| |
| ``` |
| > merge([{a="b", c="d"}, {}, {e="f", c="z"}]...) |
| { |
| "a" = "b" |
| "c" = "z" |
| "e" = "f" |
| } |
| ``` |
