Detect both edge-trigger (pressed) keys and held-to-repeat keys in Unity3D

RepeatingKeyDetector.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// @kurtdekker
//
// cheap and cheerful repeating keys in Unity3D
//
// You can lift/release them as fast as you like
// and exceed the repeat rate. Or just hold it.

public class RepeatingKeyDetector : MonoBehaviour
{
	// how fast do we repeat?
	public float RepeatInterval;

	// what keys do we act on?
	public KeyCode LeftArrow;
	public KeyCode RightArrow;

	float leftHeldTimer;
	float rightHeldTimer;

	void Reset()
	{
		RepeatInterval = 0.50f;

		LeftArrow = KeyCode.LeftArrow;
		RightArrow = KeyCode.RightArrow;
	}

	void Update ()
	{
		bool goLeftIntent = false;
		bool goRightIntent = false;

		// edge-triggered
		if (Input.GetKeyDown( LeftArrow)) goLeftIntent = true;
		if (Input.GetKeyDown( RightArrow)) goLeftIntent = true;

		// repeat-triggered
		if (Input.GetKey( LeftArrow))
		{
			leftHeldTimer += Time.deltaTime;
			if (leftHeldTimer > RepeatInterval)
			{
				goLeftIntent = true;
				leftHeldTimer -= RepeatInterval;
			}
		}
		else
		{
			leftHeldTimer = 0.0f;
		}
		if (Input.GetKey( RightArrow))
		{
			rightHeldTimer += Time.deltaTime;
			if (rightHeldTimer > RepeatInterval)
			{
				goRightIntent = true;
				rightHeldTimer -= RepeatInterval;
			}
		}
		else
		{
			rightHeldTimer = 0.0f;
		}

		// TODO: now act on the contents of goLeftIntent and goRightIntent
		if (goLeftIntent)
		{
			Debug.Log( "Go left - " + Time.time);
		}
		if (goRightIntent)
		{
			Debug.Log( "Go right - " + Time.time);
		}
	}
}