C#•2y ago

Array exception

I can't for the life of me figure out this exception. ive identified that it comes from neurons because of it not actually appending the jagged array. Im sure this is something im misunderstanding with C#, maybe something with ownership?

13 Replies

Unknown User•2y ago

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Jimmacle•2y ago

what you're missing is .Append doesn't mutate the source collection, it produces an enumerable that represents the contents of that collection with the appended item at the end C# arrays can't be resized automatically, if you want that behavior use Lists with .Add instead

UvuvOP•2y ago

im translating that ot mean its something like python, where 99.9% of functions to change things return the changed value that you then set the original variable equal to

Jimmacle•2y ago

in this specific case with .Append, yes that method is part of LINQ which is a collection of functions to filter/map collections

UvuvOP•2y ago

i c so would i have a list of lists of neurons

Jimmacle•2y ago

yes

UvuvOP•2y ago

aight bet

Jimmacle•2y ago

lists are essentially arrays but they automatically get bigger when you add items

UvuvOP•2y ago

c++ equiv of vector

Jimmacle•2y ago

yeah

UvuvOP•2y ago

and then arrays are basically the same between c# and c++ at least in application dubs

🥄feeders help me learn faster !•2y ago

In C++, array cannot be assigned directly to another array.

// c++
int p[] = { 1,2 };
int q[2];
// q = p; // Error
memcpy(q, p, sizeof(p));

// c++
int p[] = { 1,2 };
int q[2];
// q = p; // Error
memcpy(q, p, sizeof(p));

But in C#, it is ok.

// c#
int[] p = {1, 2};
int[] q = p;

// c#
int[] p = {1, 2};
int[] q = p;

Jimmacle•2y ago

it would be a more realistic comparison to use pointers and C# references are more like pointers than stack allocated variables

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