C#•2y ago

❔ Iteration over multiple objects at the same time

How do I iterate through several objects at the same time. Supposedly the objects have the same properties and I want to concat obj1.prop1 + obj2.prop1, obj1.prop2+obj2.prop2 etc etc

21 Replies

Pobiega•2y ago

.Zip list1.Zip(list2).Select(...) should do roughly that

SaltyOP•2y ago

what if i have 100 lists

Pobiega•2y ago

use a for loop also, why do you have 100 lists 😄

SaltyOP•2y ago

well its 100 objects, each is sorta like a data set image them as replicates of an experiment i want to stitch same properties from each object together

Pobiega•2y ago

right. I'd personally do that by putting all your objects into an array, then use Aggregate on that array Its fine thinker, you dont have to delete 😄

SaltyOP•2y ago

aggregate, alright ill look into it wheres my chatgpt...

Thinker•2y ago

check the docs

Pobiega•2y ago

https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.aggregate?view=net-7.0

Enumerable.Aggregate Method (System.Linq)

Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.

Pobiega•2y ago

check the examples here

Thinker•2y ago

Essentially

lists.Aggregate((a, b) =>
    new Thing(
        a.A + b.A,
        a.B + b.B,
        /*etc.*/));

lists.Aggregate((a, b) =>
    new Thing(
        a.A + b.A,
        a.B + b.B,
        /*etc.*/));

Pobiega•2y ago

the actual method definition is hard to read

SaltyOP•2y ago

ill take a look

Topend•2y ago

this is correct, Thing() can be object or function, and this will save on total ops

Thinker•2y ago

SaltyOP•2y ago

what is "lists" list of lists?

Pobiega•2y ago

no its the list of things your "data sets"

SaltyOP•2y ago

i have a list of x objects or just x objects

Pobiega•2y ago

you'll need them to be enumerable, so you need to stick them in an array or something

SaltyOP•2y ago

thats not a problem

Pobiega•2y ago

example:

var datasets = Enumerable.Range(0, 100).Select(_ => Dataset.Create()).ToArray();

var aggregateDataset = datasets.Aggregate((a, b) =>
{
    a.A += b.A;
    a.B += b.B;
    a.C += b.C;
    return a;
});

Console.WriteLine(aggregateDataset);

var datasets = Enumerable.Range(0, 100).Select(_ => Dataset.Create()).ToArray();

var aggregateDataset = datasets.Aggregate((a, b) =>
{
    a.A += b.A;
    a.B += b.B;
    a.C += b.C;
    return a;
});

Console.WriteLine(aggregateDataset);

the top line just creates 100 randomized "datasets"

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Iteration over multiple objects at the same time