Getting a string to only accept 0's and 1's

I don't understand what is wrong with this line of code in particular: bool result = userInput.All(c=>Char.IsLetter(c) && c=='1' && c=='0');

it cant be '1' and '0' at the same time

oh i see

should i make two bool results then?

or would that work

Use an or

Not an and

char is letter and (1 or 0)

oh

i'll try that rq

now that I think about it, does this strong not work in my case?

i originally had the if statement set to false, but even if I put in 0's and 1's it would still think that I put something else

is there a way to modify the bool result to only have c=='1' or c=='0'? i think the char.isLetter is the problem

i think 1 and 0 arent letters

you should remove the is lettee

would I replace the IsLetter with IsDigit in that case?

oh perfect

that was it

just is 0 or 1 is enough

lemme try that

what do you mean by this?

something is definitely going over my head

c =>

nothin

oooooh

is that a pointer?

no you arent using pointers

wait no

so what does c => mean?

im guessing is character c 1 or 0?

All takes a function as input. You need to give it a function. => is a way to define a function (called a lambda) inline...

like Func<int, bool> isChar0or1 = c => c is '0' or '1';

🙂

ok thats too complex

and just real quick, a function is also a method right

yeah i realised

sorry

its 1 am

i cant sleep

void Foo() { ... } or Action foo = () => { ... }
ate nearly the same thing but the last one is a delegate refering to a lambda instead of an ordenary method

oh so its a difference regarding format?

ill try go sleep

for sure

thanks for the help!

it has some other differences

gotcha, def got a lot to learn

sleep well 🙂

lambdas are useful but can be tricky

thanks