I have an array that looks something like:
status[0] = true
status[1] = true
status[2] = false
status[3] = true
In reality it's larger but still less than 20. I need to convert this into "ABD". Where each true represents an ordered letter in the alphabet. Can anyone think of an easy really efficient way to do this?
My napkin says this might work...
StringBuilder sb = new StringBuilder();
for(int i = 0; i < status.Length; i++)
{
if(status[i])
{
sb.Append((char)('A' + i));
}
}
string result = sb.ToString();
string input = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string result = new String(input.ToCharArray()
.Take(status.Length)
.Where((c, i) => status[i]).ToArray());
status.Length. Fixed now :DYou can use Linq:
var status = new bool[] { true, true, false, true };
// alternative 1
var statusString = string.Concat(
status.Select((val, index) => val ? (char?)('A' + index) : null)
.Where(x => x != null));
// alternative 2
var statusString2 = string.Concat(
status.Select((val, index) => val ? (object)(char)('A' + index) : ""));
// alternative 3 (same as one, no boxing)
var statusString3 = string.Concat(
status.Select((val, index) => val ? (char)('A' + index) : ' ')
.Where(x => x != ' '));
// alternative 4 (no Linq, probably faster)
var statusString4 = new StringBuilder(status.Length);
for (int i = 0; i < status.Length; i++)
{
if (status[i])
statusString4.Append((char)('A' + i));
}
String[] alphabet = new String[] {"A", "B", ... "Z"};
String result = "";
for (int i = 0; i < status.Length; i++)
{
if (status[i] == true) result += alphabet[i];
}
Basically, you can create an array of the letters of the alphabet and match the true values of your status array to the corresponding letter.
Alphabet array.
if (foo == true)!! 5 points from Gryffindor! (no need for == true)
== true.
==true because it eventually morphs to !=true or !=false. Obviously personal preference.Create a class like this:
class Bool2CharArrayConverter
{
public static string ConvertArray(bool[] Input)
{
int asc = 65;
StringBuilder response = StringBuilder();
foreach (bool val in Input)
{
if (val)
{
response.Append( Convert.ToChar(asc));
}
asc++;
}
return response.ToString();
}
}
which can be invoked like this:
bool[] status = new bool[]{true,true,false,true};
string output = Bool2CharArrayConverter.ConvertArray(status);
Console.WriteLine(output); //output = ABD
