CODEWITHSUNDEEP
c#linq
Willy
Willy

Reputation: 10648

C# LINQ - Comparing to float lists

I have two lists of floats and both with the same size, for example:

List<float> list1 = new List<float>{ 2.1, 1.3, 2.2, 6.9 }
List<float> list2 = new List<float>{ 2.5, 3.3, 4.5, 7.8 }

Using LINQ I would like to check if all items in list1 are less or equal than those in list2, for example:

2.1 <= 2.5
1.3 <= 3.3
2.2 <= 4.5
6.9 <= 7.8

In this case I want to obtain true as result as all items in list1 are <= items in list2. What is the best efficient way to do it?

Upvotes: 2

Views: 903

Answers (3)

Jon Skeet
Jon Skeet

Reputation: 1500535

It sounds like you want Zip, if you really want to compare these pairwise. (It's not true to say that all items in list1 are smaller than all items in list2, as 6.9 is greater than 2.5 for example.)

Using Zip:

bool smallerOrEqualPairwise = list1.Zip(list2, (x, y) => x <= y)
                                   .All(x => x);

Or:

bool smallerOrEqualPairwise = list1.Zip(list2, (x, y) => new { x, y })
                                   .All(pair => pair.x <= pair.y);

The first option is more efficient, but the second is perhaps more readable.

EDIT: As noted in comments, this would be even more efficient, at the possible expense of more readability (more negatives).

bool smallerOrEqualPairwise = !list1.Zip(list2, (x, y) => x <= y)
                                    .Contains(false);

Upvotes: 7

Ahmed KRAIEM
Ahmed KRAIEM

Reputation: 10427

bool result = Enumerable.Range(0, list1.Count).All(i => list1[i] <= list2[i]);

Upvotes: 0

vc 74
vc 74

Reputation: 38179

list1.Zip(list2, (x, y) => new { X = x, Y = y }).
      All(item => (item.X <= item.Y))

Upvotes: 0

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