> ## Documentation Index
> Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Conditional Expressions

> Explore how to use arithmetic, comparison, equality, logical, and conditional operators in OpenTofu configurations and the interactive console.

Explore how to use arithmetic, comparison, equality, logical, and conditional operators in OpenTofu configurations and the interactive console.

## Table of Contents

* [Interactive Arithmetic in the Console](#interactive-arithmetic-in-the-console)
* [Equality & Inequality Operators](#equality--inequality-operators)
* [Comparison Operators](#comparison-operators)
* [Logical Operators & NOT](#logical-operators--not)
* [Defining Variables and Testing Expressions](#defining-variables-and-testing-expressions)
* [Ternary (Conditional) Expressions in Configurations](#ternary-conditional-expressions-in-configurations)
* [References](#references)

***

## Interactive Arithmetic in the Console

You can quickly evaluate math expressions in the OpenTofu console:

```bash theme={null}
$ tofu console
> 1 + 2
3
> 10 / 4
2.5
> 7 * (3 - 1)
14
```

## Equality & Inequality Operators

Equality and inequality comparisons return a Boolean. Use them to compare values of any type:

```bash theme={null}
$ tofu console
> 8 == 8
true
> 8 != "8"
true
> 8 == "8"
false
```

<Callout icon="lightbulb" color="#1CB2FE">
  The operators `==` and `!=` are **type-sensitive**. A number and a string holding the same digits are considered unequal.
</Callout>

## Comparison Operators

Numeric comparisons also yield Boolean results. Here’s a quick reference:

| Operator | Description              | Example         |
| -------- | ------------------------ | --------------- |
| `>`      | Greater than             | `5 > 4` → true  |
| `>=`     | Greater than or equal to | `5 >= 5` → true |
| `<`      | Less than                | `3 < 4` → true  |
| `<=`     | Less than or equal to    | `3 <= 3` → true |

```bash theme={null}
$ tofu console
> 5 > 7
false
> 4 <= 5
true
```

## Logical Operators & NOT

Combine Boolean expressions using **AND** (`&&`) and **OR** (`||`), and invert them with **NOT** (`!`):

```bash theme={null}
$ tofu console
> (8 > 7) && (8 < 10)
true
> (8 > 10) || (8 < 10)
true
> !(8 == 8)
false
```

## Defining Variables and Testing Expressions

You can declare variables in HCL and reference them in the console:

```hcl theme={null}
variable "a" {
  type    = number
  default = 50
}

variable "b" {
  type    = number
  default = 25
}
```

```bash theme={null}
$ tofu console
> var.a > var.b
true
> var.a + var.b
75
```

## Ternary (Conditional) Expressions in Configurations

Use the ternary operator (`condition ? true_val : false_val`) to enforce defaults. For example, generate a random password whose length is at least 8 characters:

```hcl theme={null}
variable "length" {
  type        = number
  description = "Desired password length (minimum 8)"
}

resource "random_password" "password_generator" {
  length = var.length < 8 ? 8 : var.length
}

output "password" {
  value     = random_password.password_generator.result
  sensitive = true
}
```

<Callout icon="triangle-alert" color="#FF6B6B">
  Always enforce a minimum length for generated passwords to maintain security standards.
</Callout>

Initialize, plan, and apply:

```bash theme={null}
$ tofu init
$ tofu plan -var='length=5'
$ tofu apply -var='length=5' -auto-approve
```

Even if you pass `length=5`, OpenTofu generates an 8-character password. Passing a higher value (e.g., 12) yields a 12-character result.

***

## References

* [OpenTofu Documentation](https://docs.opentofu.org/)
* [Random Provider: `random_password` Resource](https://registry.terraform.io/providers/hashicorp/random/latest/docs/resources/password)
* [Terraform Expressions](https://www.terraform.io/docs/language/expressions/index.html)

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