Bugs in the article are trivially obvious, because they're in 3-line code examples, explicitly pointed out. The problem is, the same bugs happen in actual larg

Bugs in the article are trivially obvious, because they're in 3-line code examples, explicitly pointed out. The problem is, the same bugs happen in actual large codebases, without the priming to look for this particular issue out of hundreds of possible issues. It's a difference between an article saying "This is Waldo" (duuh!) and a "Where's Waldo?" game, where you don't even know how many Waldos are there.