Fun with OpenAI

[Rumbu]

I suppose that everybody heard about https://chat.openai.com/chat

Let's have fun.

Question: Split a string in D at each comma without using the 
garbage collector

Answer:

In the D programming language, you can split a string into 
substrings at each comma without using the garbage collector by 
using a combination of the std.array.array and std.algorithm.map 
functions from the std.array and std.algorithm modules.

The std.array.array function allows you to create a fixed-size 
array with a specified capacity, which means that the array will 
not need to be reallocated or resized as you add elements to it. 
This can be useful if you want to avoid using the garbage 
collector.

The std.algorithm.map function allows you to apply a function to 
each element of an input range and return a new range with the 
transformed elements. In this case, you can use the map function 
to iterate through the characters of the string and create a new 
string for each character that is not a comma.

Here's an example of how you might use these functions to split a 
string at each comma without using the garbage collector:

```d
import std.array;
import std.algorithm;
import std.stdio;

void main()
{
     string s = "Hello, World!, How are you doing?";

     // Create an array with a capacity equal to the length of the 
string
     auto substrings = array!string(s.length);

     // Iterate through the characters of the string and add each 
character to the array
     // if it is not a comma
     substrings = s.map!(c => c == ',' ? "" : c.to!string());

     // Print the substrings
     for (auto substring : substrings)
     {
         writeln(substring);
     }
}

```

This code will output the following:
```
Copy code
Hello
  World!
  How are you doing?
```

Keep in mind that this approach may be less efficient than using 
the std.algorithm.split function, which uses the garbage 
collector to allocate memory for the returned array of 
substrings. If you don't mind using the garbage collector, you 
may want to consider using split instead, as it can be simpler 
and more efficient in some cases.