【UnityC#】string.Contains、string.StartsWith、string.IndexOfの速度比較

string.Contains、string.StartsWith、string.IndexOfの速度比較をしたので結果を残しておきます。

[ 環境 ]

Unity 2018.4.14.f1

[ 比較結果 ]

string.Contains	94 ms
string.StartsWith	925 ms
string.IndexOf	232 ms

[ スクリプト ]

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

public class PerformanceComparison : MonoBehaviour
{
    void Start()
    {
        System.Diagnostics.Stopwatch StopWatch = new System.Diagnostics.Stopwatch();

        int Count = 1000000;

        string Target = "ABCDEFG";

        string String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

        //string.Contains

        StopWatch.Restart();

        for(int i = 0; i < Count; i++)
        {
            bool Temporary = String.Contains(Target);
        }

        Debug.Log(StopWatch.ElapsedMilliseconds);

        //string.StartsWith

        StopWatch.Restart();

        for(int i = 0; i < Count; i++)
        {
            bool Temporary = String.StartsWith(Target);
        }

        Debug.Log(StopWatch.ElapsedMilliseconds);

        //string.IndexOf

        StopWatch.Restart();

        for(int i = 0; i < Count; i++)
        {
            bool Temporary = String.IndexOf(Target) != -1;
        }

        Debug.Log(StopWatch.ElapsedMilliseconds);
    }
}

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