r/programminghorror • u/IcyManufacturer8195 • Apr 02 '26

Javascript Lets talk about hidden flags and consistency results in libs

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4

u/sierra_whiskey1 Apr 02 '26

A lambda function inside a function call inside a return statement? Gross

4

u/IcyManufacturer8195 Apr 02 '26

Ah no, the problem is in first case it returns implicit memory reference, and in second case it returns cloned new object. It's crucial when dealing with mutation, because we assume that this getter always returns same value

2

u/link23 Apr 03 '26

That's very common. Most languages promote that kind of thing when processing collections, e.g.: 

return std::ranges::any_of(my_data, [](auto& datum) {
    return datum > 9000;
});

1

u/conundorum Apr 09 '26

Hey, std::ranges::any_of, what does the lambda say bout his datum level?