> In industry, nobody seems to use big-O notation. Ironically, it's because big-O notation is too theoretical and doesn't respect real-world complexity. Big-O

> In industry, nobody seems to use big-O notation. Ironically, it's because big-O notation is too theoretical and doesn't respect real-world complexity. Big-O is used to see when the operations are of sizes out of normal use and big-O doesn't represent hardware complexity (like latency differences, size limitations, or caching).