How to replace a character in string using LINQ

Question

for example:- replace 2 with 0 for the following input Input: string strInput = "21212121"; Output: "01010101" How to do it with LINQ. Note: dataType is string.

Accepted Answer

For your interviewer

```
string output = new String(input.Select(ch => ch == '2' ? '0' : ch).ToArray());
```

I think intend was to see if you understand that string could be treated as sequence of characters. Interviews often have questions not related to real-life programming. I personally hate questions about inheritance tree with `new` modifiers.

How to replace a character in string using LINQ

Solution

Problem