D and Nim

[Ary Borenszweig via Digitalmars-d]

On 1/4/15 11:09 PM, weaselcat wrote:
> On Monday, 5 January 2015 at 01:56:20 UTC, Ary Borenszweig wrote:
>> On 1/4/15 9:27 PM, bearophile wrote:
>>> Walter Bright:
>>>
>>>> Nim:
>>>>
>>>>   for neighbour in nodes[nodeId].neighbours:
>>>>
>>>> D:
>>>>
>>>>   foreach(immutable route neighbour; nodes[nodeID].neighbours){
>>>>
>>>> Correctly written D:
>>>>
>>>>    foreach (neighbour; nodes[nodeID].neighbours){
>>>
>>> I don't agree, the good D way is:
>>>
>>> foreach (immutable neighbour; nodes[nodeID].neighbours) {
>>>
>>> D programmers should apply const/immutable to every variable that
>>> doesn't need to mutate.
>>
>> Why?
>
> Implies intention of the variable at declaration & gives the compiler
> more opportunities for optimization

The first, maybe (for me it's noise: if I want to mutate it, I do, 
otherwise I don't).

For the second, the compiler can tell that if you don't assign anything 
more to it then it's immutable. So I'm not sure the second one is true.