I have a 2 dimensional array int[][] data and i want to see if the value contains the value 45 for example
I created this line of code
bool contains = data.Where(x => x.Contains(45)).ToArray().Count() != 0 ? true : false;
but it looks like there is unnecessary code and I am sure that there is an easier or more efficient way to do this
You could use Any linq extension.
bool exists = data.SelectMany(x=>x).Any(x=>x == 45);
Or
bool exists = data.Any(x=>x.Any(s=>s == 45));
Array.IndexOf is optimised for integer arrays, so if your inner arrays are long and you care about speeding it up that much it might be worth doing it like this:
bool exists = data.Any(a => Array.IndexOf(a, 45) != -1);
int[] is an ICollection<int>. Enumerable.Contains<T> calls the ICollection<T>.Contains method if the source is an ICollection<T>. So in the version data.Any(a => a.Contains(45)) the Contains method of array is used, and this is as well optimized as IndexOf. But good point that this will be a little bit better than the SelectMany version. Though I think it's only a micro-optimization even for very large arrays (but I did not measure it).There are two issues in your code:
data is not an array of int, it is an array int[]bool condition and returns a value based on the bool value. So x ? true : false is the same as x. There is no need for the operator.So what (I assume) you want is not to check if data contains 45, but if any of the arrays in data contains 45. So you either flatten the jagged array into on enumeration using SelectMany or concat two Any calls:
bool contains = data.SelectMany(d => d).Contains(45);
or
bool contains = data.Any(d => d.Contains(45);
.ToArray().Count() != 0can be replaced by.Any(), but more importantly we can't guess what does make you happy. Please read How to Ask and try to edit this into an actually answerable question, and share your research.