Recently one of LA-based startups I am acquainted with approached me to ask for the code assessment. They had terrible problems with code instability, random crashes and stuff like that. What can I say? The code was rich with mistakes I've mentioned in my previous article (especially force unwraps and force casts, to which I salute, as they were the reason behind loads of crashes). But there was one particular mistake that I've been seeing over and over in different projects since people understood that all the functions in Swift are first class higher order.


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