Pre-sizing Lists
The lesson explains the internal doubling-expansion algorithm that generic List uses when capacity is exhausted, and how pre-allocating capacity with the constructor's int parameter eliminates those copy operations. We discuss when pre-sizing is worth the effort and introduce arrays as the fastest alternative when the element count is known in advance.
Previous Module
A Crash Course In Intermediate Language
This Module
Basic Performance Optimizations
Optimizing Boxing And Unboxing
Collection And Data Classes To Avoid
Demo: Benchmarking Boxing And Unboxing
String and StringBuilder Performance (part 1)
String and StringBuilder Performance (part 2)
Demo: Benchmarking String versus StringBuilder
List and Array Performance
Pre-sizing Lists
Demo: Benchmarking Lists and Arrays
Demo: Lists and Arrays in Intermediate Language
Lists and Arrays Performance Recap
Exception Performance
Parse versus TryParse