C#•13mo 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•13mo ago

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

Salty•13mo ago

what if i have 100 lists

Pobiega•13mo ago

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

Salty•13mo 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•13mo 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 😄

Salty•13mo ago

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

Thinker•13mo ago

check the docs

Pobiega•13mo 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•13mo ago

check the examples here

Thinker•13mo 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•13mo ago

the actual method definition is hard to read

Salty•13mo ago

ill take a look

Topend•13mo ago

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

Thinker•13mo ago

Salty•13mo ago

what is "lists" list of lists?

Pobiega•13mo ago

no its the list of things your "data sets"

Salty•13mo ago

i have a list of x objects or just x objects

Pobiega•13mo ago

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

Salty•13mo ago

thats not a problem

Pobiega•13mo 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•13mo 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