发现代码

描述：

返回一个数字在数组里出现的次数

例如：

var sample = { 1, 0, 2, 2, 3 };
NumberOfOccurrences(0, sample) == 1;
NumberOfOccurrences(2, sample) == 2;

MyCode:

using System;

public class OccurrencesKata
{
    public static int NumberOfOccurrences(int x, int[] xs)
  {
    int count = 0;//定义要返回的出现次数
    foreach(int i in xs)//遍历数组里的每个整数，若与x相等，则count+1
      {
        if(x == i)
          count++;
      }
      return count;
  }
}

CodeWar:

using System;
using System.Linq;

public class OccurrencesKata
{
  public static int NumberOfOccurrences(int x, int[] xs)
  {
    return xs.Count(num => num == x);
  }
}