C#•3y ago

Is it possible to subtract a character from a string?

I've found that I can add strings, but can't figure out how to subtract strings, or characters from strings. Is there a function already in existence that can erase a character from a string, or replace the index of a string with a letter?

15 Replies

mtreit•3y ago

Strings are immutable but you can call methods like Replace or Substring to make a new string with changed content.

GrinOP•3y ago

thank you I will check them out

mtreit•3y ago

If you need to replace characters by index you can also convert to a char array, update that, and then make a new string from the result.

MODiX•3y ago

mtreit#6470

REPL Result: Success

var s = "ABC";
var chars = s.ToCharArray();
chars[1] = '1';
var s2 = new string(chars);

Console.WriteLine(s2);

var s = "ABC";
var chars = s.ToCharArray();
chars[1] = '1';
var s2 = new string(chars);

Console.WriteLine(s2);

Console Output

A1C

A1C

Compile: 543.859ms | Execution: 73.735ms | React with ❌ to remove this embed.

GrinOP•3y ago

neat I think thats what I needed I gotta ask about the var I've noticed that alot here, I like setting my stuff up as ints, chars, strings but it seems professionals only use var is that common practice

mtreit•3y ago

If it's obvious from the right side of the equal sign what the type is, then var is just more concise and in my opinion easier to read. It is especially the case with things like generic type declarations:

Dictionary<string, List<HashSet<string>>> map = new Dictionary<string, List<HashSet<string>>>();

Dictionary<string, List<HashSet<string>>> map = new Dictionary<string, List<HashSet<string>>>();

vs.

var map = Dictionary<string, List<HashSet<string>>>();

var map = Dictionary<string, List<HashSet<string>>>();

If you're really hardcore like @Jayy you actually enforce the use of var and don't let anything be checked in that doesn't use it. I think that's a rather extreme position and I'm not in favor of that myself.

Jayy•3y ago

It's great

GrinOP•3y ago

lol

Jayy•3y ago

Editorconfig is smart enough that it only fails if you CAN use var And it's language version specific We got a bunch of new failures when i bumped us to c# 10 and suddenly a lot of lhs explicitly typed lambdas started failing Cuz c# could infer it now

GrinOP•3y ago

sounds complicated

Jayy•3y ago

I mean not really lol

GrinOP•3y ago

hope I'll be able to understand that lingo soon

Jayy•3y ago

Took maybe 30 seconds to fix it

mtreit•3y ago

Explicitly typed lambda meaning like Func<int, int> xyz = // something ? Or do you mean something else?

Jayy•3y ago

Yee that We have a shitty retry function that's used all over the places that needs that pattern

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Is it possible to subtract a character from a string?