SoloLearn Code Challenges

Question

That's a post for the Code Challenges against other SoloLearn user. When you don't understand why you answer was wrong in one Challenge or how the answer was right just write the Challenge question bellow in the comments. ^^

Answer 1

If you run it like this:

int[] arr = {10, 15, 16};
var x = arr.FirstOrDefault(z => z.Equals(14));
Console.WriteLine(arr.FirstOrDefault());
Console.WriteLine(x);
Console.WriteLine(x + 15);

You will see that z = 10 (first value in the array). 10.Equals(14) = 0, so x = 0. And 0 + 15 will be 15.

Answer 2

No i think z.Equals(14) will produce a boolean, so 1 if it is true.

Answer 3

I was wrong, x is 14 if 14 is in the array, otherwise it is 0.
somebody else asked the same question earlier on sololearn, i found it with google:
https://www.sololearn.com/Discuss/2129959/can-anyone-explain-this-bit-of-code-i-don-t-really-get-the-expression-assigned-to-x

Answer 4

Well I will Just start then I don't understand why the answer is 15, I memorized it but I don't know why.
C# Code Challenge
What's the output of this Code:
Int[] arr = {10, 15, 16};
var x = arr.FirstOrDefault(z => z.Equals(14));
Console.WriteLine(x + 15);

Answer 5

I See so does that mean than that if the first value was 14. x would be 14?

Answer 6

I just tried it and when the First value of arr is 14 then x is also 14.

Answer 7

Thanks now I don't Just have the self Test but also the theory knowleght. ^^