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book: Explain better why the filter closure gets a reference - #31870
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As a Rust newbie, I found the book's explanation for why the `filter` closure gets a reference very confusing, and tried to figure out why `filter` is somehow less consumptive than `map` -- but it isn't; that's controlled by `iter`/`into_iter`. I flailed around for a while until @habnabit explained it to me, and in retrospect it is quite obvious :-)
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As a Rust newbie, I found the book's explanation for why the
filterclosure gets a reference very confusing, and tried to figure out whyfilteris somehow less consumptive thanmap-- but it isn't; that's controlled byiter/into_iter. I flailed around for a while until @habnabit explained it to me, and in retrospect it is quite obvious :-)