I have the following String word = "12345"; I want to split each character and insert this into an int array
like this-
int[] array = { 1, 2, 3, 4, 5};
whats the fastest and easiest way to do this ?
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Some search on the internet? There are thousand topics out there to split a string, convert a character to integer. Everythings out there.MakePeaceGreatAgain– MakePeaceGreatAgain2016-06-24 11:46:36 +00:00Commented Jun 24, 2016 at 11:46
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Possible duplicate of convert char array to int array c#MakePeaceGreatAgain– MakePeaceGreatAgain2016-06-24 11:48:53 +00:00Commented Jun 24, 2016 at 11:48
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3 Answers
Try using Linq:
String word = "12345";
int[] array = word
.Select(c => c - '0') // fastest conversion
.ToArray();
answered Jun 24, 2016 at 11:33
Dmitrii Bychenko
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3 Comments
jpaugh78
Can you explain what exactly is happening in that Select command?
Dmitrii Bychenko
@jpaugh78:
c is char and after subtracting 0 Select returns integer difference between c and 0 which is 0 for 0, 1 for 1 ... 9 for 9jpaugh78
okay, I think that makes sense. I don't often deal with char, so it was a new concept for me.
String word = "12345";
int[] array = word.Select(x => int.Parse(x.ToString())).ToArray();
Comments
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reactive.Disposables;
using System.Reactive.Linq;
public static class Extensions
{
/// <summary>
/// Creates a int array from a String.
/// </summary>
/// <param name="source">The source.</param>
/// <returns>an Int Array</returns>
public static IObservable<IEnumerable<int>> StringToIntArray(this string source)
{
return Observable.Create<IEnumerable<int>>(sub =>
{
var sourceAsStringArray = source.ToCharArray().Select(x => x.ToString());
var l = new List<int>();
foreach (var s in sourceAsStringArray)
{
int output = -1;
if (int.TryParse(s, out output))
{
l.Add(output);
}
}
sub.OnNext(l);
sub.OnCompleted();
return Disposable.Empty;
});
}
}
private async void Test()
{
var a = await "12345".StringToIntArray();
var b = await "1a234b5".StringToIntArray();
var invalid = await "IAmNotANumber".StringToIntArray();
}
