LINQ

LINQ

Language Integrated Query (LINQ) lets you query collections with expressive, composable operators:

int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

// Filter
var evens = nums.Where(n => n % 2 == 0);
// { 2, 4, 6, 8, 10 }

// Transform
var squares = evens.Select(n => n * n);
// { 4, 16, 36, 64, 100 }

// Aggregate
int total = nums.Sum();       // 55
int max = nums.Max();         // 10
double avg = nums.Average();  // 5.5

Chaining

LINQ operators return IEnumerable<T>, so they can be chained:

var result = nums
    .Where(n => n > 3)
    .Select(n => n * 2)
    .OrderByDescending(n => n)
    .Take(3);
// { 20, 18, 16 }

Your Task

Write a static method TopSquares(int[] nums) that:

1. Filters to only even numbers
2. Computes each even number's square
3. Returns the sum of those squares