Simple demonstration of looking up XP into a Player Level table

SearchXPTable.cs

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

// @kurtdekker - ultra-simple XP to Level lookup table
// drop it on a blank GameObject to test it, look in the console

public class SearchXPTable : MonoBehaviour
{
	// CAUTION: This is subject to all of Unity3D's serialization rules!!!
	// eg, once set in your scene or prefab, these default ctor() values
	// are NEVER USED AGAIN!!
	
	[Header("Must be ascending order always:")]
	public int[]  XPBenchmarks = new int[] { 10, 20, 50, 100, 200, 500, 1000};

	int ComputeLevelFromXP( int xp)
	{
		for (int i = 0; i < XPBenchmarks.Length; i++)
		{
			if (xp < XPBenchmarks[i])
			{
				return i + 1;
			}
		}
		return XPBenchmarks.Length + 1;
	}

	void Start ()
	{
		// demos the above by blasting 2000 tests through it to console
		for (int xp = 0; xp <= 2000; xp++)
		{
			int level = ComputeLevelFromXP( xp);

			Debug.Log( System.String.Format( "xp = {0} means level = {1}", xp, level));
		}
	}
}