# Terraform Type Constraints (Collection & Structural)

### Type Constraints - Terraform Variables

* Type constraints control the type of variable values
* Primitive (Single type value)
  * number, string, bool
* Complex (Multiple types in a single variable)
  * list, tuple, map, object

### Complex types - Collections

* Collection types allow multiple values of one primitive types to be grouped together.
* Constructors of these Collections include:
  * list(type)
  * map(type)
  * set(type)

<figure><img src="/files/hBk261rINW1I80mO3249" alt=""><figcaption></figcaption></figure>

### Complex types - Structural

* Structural types allow multiple values of different primitive types to be grouped together
* Constructors of these Collections include:
  * object(type)
  * tuple(type)
  * set(type)

<figure><img src="/files/B4KjdOqrv8aXD44ltNDi" alt=""><figcaption></figcaption></figure>

### Dynamic types - The "any" constraint

* **Any** is a placeholder for primitive type yet to be decided
* Actual type will be determined at runtime

<figure><img src="/files/zwOKJk4J22Y5VQjLrUDS" alt=""><figcaption></figcaption></figure>


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