Difference between concatenation and appendation

[Laeeth Isharc via Digitalmars-d-learn]

On Monday, 26 January 2015 at 01:57:04 UTC, bearophile wrote:
> Laeeth Isharc:
>
>> I think concatenation and append are used as synonyms (the 
>> same meaning is meant).  a~=b or a=a~b
>
> a=a~b always allocates a new array, while a~=b sometimes 
> re-allocates in place.
>
> Bye,
> bearophile

Thanks. That makes sense.