Why most Delphi examples use FillChar() to initialize records?

Question

I just wondered, why most Delphi examples use FillChar() to initialize records.

type
  TFoo = record
    i: Integer;
    s: string; // not safe in record, b         


        

Answer 1

FillChar is fine to make sure you don't get any garbage in a new, uninitialized structure (record, buffer, arrray...).
It should not be used to "reset" the values without knowing what your are resetting.
No more than just writing MyObject := nil and expecting to avoid a memory leak.
In particulart all managed types are to be watched carefully.
See the Finalize function.

When you have the power to fiddle directly with the memory, there is always a way to shoot yourself in the foot.