I prefer this technique (uses less memory and may be faster, but requires slightly more code):
public bool IsPalindrome(string str, StringComparison comparisonType)
{
bool valid = true;
int halfway = str.Length / 2;
int lastIndex = str.Length - 1;
for (int i = 0; i < halfway; i++)
{
if (!str.Substring(i, 1).Equals(str.Substring(lastIndex - i, 1), comparisonType))
{
valid = false;
break;
}
}
return valid;
}
You can then provide an overload to avoid passing in the comparison type:
public bool IsPalindrome(string str)
{
return IsPalindrome(str, StringComparison.OrdinalIgnoreCase);
}
