Bits of .NET

Array operations creating copies wastes memory. Span provides view over memory without copying.

Traditional Array Slicing:

int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
int[] slice = numbers.Skip(2).Take(5).ToArray();  
// Creates new array, copies 5 elements

With Span:

int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
Span slice = numbers.AsSpan(2, 5);  
// No copy, just points to same memory!
// slice[0] is numbers[2]

Performance:

// Process 1 million element array
var data = new int[1_000_000];

// Old way (creates copy):
ProcessArray(data.Skip(100).Take(1000).ToArray());  // 2ms + allocation

// Span way (no copy):
ProcessSpan(data.AsSpan(100, 1000));  // 0.05ms, no allocation
// 40x faster!

Essential for high-performance code!