# 06 Validations

This example shows you how to use validations in a signal.

These files can be found in the /Examples/\[example] and /Blackboards/Examples folders.

![Example 06 Validations editor](/files/JBYiLlRA8cIrkxua4lZf)

## ValidationsBlackboard.cs

```csharp
using CrashKonijn.BlackboardPro.Blackboards.Examples.Attributes;
using CrashKonijn.RabbitBlackboard.Contracts;

namespace CrashKonijn.BlackboardPro.Blackboards.Examples
{
    public partial class ValidationsBlackboard : BlackboardBehaviour
    {
        // This value can never be less than 0
        // Note: that this is not the same attribute as the one Unity provides.
        [Min(0)]
        private int _bullets;

        // This is a custom validation that will capitalize the string
        // It can be viewed in ./Attributes/CapitalizeAttribute.cs
        [Capitalize]
        private string _name;

        // Validations can be stacked!
        // This value can never be less than 0 or greater than 150
        [Min(0)]
        [Max(150)]
        private int _health;

        // This is a computed signal that is normalized health between 0 and 1.
        // Even if health becomes higher than 100, this value will never be higher than 1.
        [Normalize(100f, true)]
        private static float _normalizedHealth(Signals.Health health) => health.Value;

        // This is a computed signal that is a curve between 0 and 1.
        [EaseInOutCurve(0f, 1f, 1f, 0f, 2f)]
        [MinMax(0f, 1f)]
        private static float _shouldHeal(Signals.NormalizedHealth health) => health.Value;
    }
}

```

## ValidationsHealthBehaviour.cs

```csharp
using CrashKonijn.BlackboardPro.Blackboards.Examples;
using CrashKonijn.RabbitBlackboard.Contracts;
using UnityEngine;

namespace CrashKonijn.BlackboardPro.Examples._06_validations
{
    [RequireComponent(typeof(ValidationsBlackboard))]
    public class ValidationsHealthBehaviour : MonoBehaviour
    {
        /* Simple hack to show a button in the editor */
        [Header("Removes 10 health.")]
        [Button(nameof(DoDamage))]
        public string doDamageButton;

        /* Simple hack to show a button in the editor */
        [Header("Adds 10 health")]
        [Button(nameof(Heal))]
        public string healButton;

        /* Simple hack to show a button in the editor */
        [Header("Add 5 bullets.")]
        [Button(nameof(AddBullets))]
        public string addBulletsButton;

        /* Simple hack to show a button in the editor */
        [Header("Removed 5 bullets")]
        [Button(nameof(RemoveBullets))]
        public string removeBulletsButton;

        private ValidationsBlackboard blackboard;

        public ValidationsBlackboard Blackboard
        {
            get
            {
                if (this.blackboard == null)
                {
                    this.blackboard = this.GetComponent<ValidationsBlackboard>();
                }

                return this.blackboard;
            }
        }

        public void DoDamage()
        {
            this.Blackboard.Health -= 10;
        }

        public void Heal()
        {
            this.Blackboard.Health += 10;
        }

        public void AddBullets()
        {
            this.Blackboard.Bullets += 5;
        }

        public void RemoveBullets()
        {
            this.Blackboard.Bullets -= 5;
        }
    }
}

```


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