Getting a list of strings with only the first and last character from another list LINQ-CodePudding

From a given list of strings I need to use LINQ to generate a new sequence of strings, where each string consists of the first and last characters of the corresponding string in the original list.

Example:

stringList: new[] { "ehgrtthrehrehrehre", "fjjgoerugrjgrehg", "jgnjirgbrnigeheruwqqeughweirjewew" },
expected: new[] { "ee", "fg", "jw" });

list2 = stringList.Select(e => {e = ""   e[0]   e[e.Length - 1]; return e; }).ToList();

This is what I've tried, it works, but I need to use LINQ to solve the problem and I'm not sure how to adapt my solution.

CodePudding user response：

As mentioned in the comment that Select is already part of LINQ, you can use this code.var output = arr.Select(x => new string(new char[] { x.First(), x.Last() })).ToList();

CodePudding user response：

Here you go:

var newList = stringList.Select(e => $"{e[0]}{e[e.Length - 1]}").ToList();

CodePudding user response：

appraoch with Linq and String.Remove()

string[] input = new[] { "ehgrtthrehrehrehre", "fjjgoerugrjgrehg", "jgnjirgbrnigeheruwqqeughweirjewew" };
string[] result = input.Select(x => x.Remove(1, x.Length - 2)).ToArray();