LINQ can do more than filter and sort: it can summarize and group your data.
➕ Aggregation: Sum, Count, Average, Min, Max
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int[] numbers = { 1, 2, 3, 4, 5 };
int sum = numbers.Sum(); // 15
int count = numbers.Count(); // 5
double avg = numbers.Average(); // 3
int min = numbers.Min(); // 1
int max = numbers.Max(); // 5
👥 Grouping with GroupBy
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string[] fruits = { "Apple", "Avocado", "Banana", "Apricot" };
var groups = fruits.GroupBy(f => f[0]);
foreach (var group in groups)
{
Console.WriteLine($"Fruits starting with {group.Key}:");
foreach (var fruit in group)
Console.WriteLine(fruit);
}
💡 Try It!
Count how many times each word appears in a list:
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string[] words = { "cat", "dog", "cat", "bird" };
var counts = words.GroupBy(w => w)
.Select(g => new { Word = g.Key, Count = g.Count() });
foreach (var item in counts)
Console.WriteLine($"{item.Word}: {item.Count}");
Next: LINQ with objects!
