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HOW TO COLLECT VEC<RESULT<OPTION<T>>> INTO VEC<T>?
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Apr 23, 2023 Using filter_map(Result::transpose) works nicely in this particular case because it is filtering Result<Option<T>, E>, and the transformation to Option<Result<T, … ...

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RUST - IS IT POSSIBLE TO MAP A FUNCTION OVER A VEC WITHOUT …
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Jan 24, 2017 I would now like to call transform on each element of data and store the resulting value back in data. I could do something like … ...

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RUST - WHAT'S THE MOST IDIOMATIC WAY OF WORKING WITH AN …
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Apr 2, 2016 If you just want to panic, use .map(|x| x.unwrap()). If you want all results or a single error, collect into a Result<X<T>>: let results: Result<Vec<i32>, _> = … ...
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R/RUST ON REDDIT: WHEN DOES …
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Rust has a nifty optimization for the following pattern: vec.into_iter().map(|x| x * 5).collect() where vec has type Vec<i32>. In this case, the compiler will produce code that … ...
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ERROR HANDLING AND ITERATOR, MAP, COLLECT - HELP - THE RUST …
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Jan 17, 2016 let ip_parts = addr_parts[0].split("."). map(|s| s.parse::<u8>().ok().expect("only numbers 0-255 in ip address")). collect::<Vec<u8>>(); … ...

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ELEGANT WAY TO CONVERT VEC TO MAP - HELP - THE RUST …
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Sep 22, 2021 Is there a more elegant (or idiomatic) way to convert a vec into a map? The usual way i can think of is below: use std::collections::BTreeMap; #[derive(Debug, … ...

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HOW TO USE "AWAIT?" INSIDE VEC.ITER().MAP() IN AN ASYNC FN?
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Oct 1, 2021 If you have a small number of elements then join_all(iter.map(|x| async { can.await here }) will work. If the number of elements is huge, then I suggest using a … ...

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MAP IN STD::ITER - RUST
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Jun 10, 2024 The map iterator implements DoubleEndedIterator, meaning that you can also map backwards: let v: Vec<i32> = [ 1 , 2 , 3 ].into_iter().map(|x| x + 1 … ...

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VEC_MAP::VECMAP - RUST - DOCS.RS
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Creates an empty VecMap with space for at least capacity elements before resizing. Examples. use vec_map :: VecMap ; let mut map: VecMap<&str> = VecMap :: … ...

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VEC IN STD::VEC - RUST - LEARN RUST
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vec![x; n], vec![a, b, c, d], and Vec::with_capacity(n), will all produce a Vec with at least the requested capacity. If len == capacity, (as is the case for the vec! macro), then a Vec<T> … ...

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CONVERT LIST OF LISTS (LIKE VEC OF VEC) INTO HASHMAP? : R/RUST - REDDIT
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Hashmap already has an implementation of FromIterator<(K, V)>, so a Vec<Vec<K, V>> can be turned in to a new hashmap just with flatten and collect, eg: let data: … ...

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VEC_MAP - RUST
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A simple map based on a vector for small integer keys. Space requirements are O (highest integer key). Structs. Enums. API documentation for the Rust `vec_map` crate. ...

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PROPOSAL: ADD A `MAP` FUNCTION TO `VEC` : R/RUST - REDDIT
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A quick grep on the rustc codebase found 884 cases this could help. Just under half of them immediately collected, implying a map_and_collect function might also be useful. ...

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RUST - HOW DO I COLLECT INTO AN ARRAY? - STACK OVERFLOW
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Nov 5, 2014 collect as_slice try_into + unwrap() Iterator<T> -----> Vec<T> -----> &[T] -----> [T] But I would just call it a workaround. You need to include std::convert::TryInto … ...

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COLLECTING NON-OPTION ITEMS INTO OPTION<VEC<>> - HELP - THE RUST ...
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Dec 4, 2021 If you unconditionally want it to be Some then you can just collect into a Vec<Item> and then wrap in a Some, there isn't any need to do it inside the iterator. If … ...

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RUST - IDIOMATIC WAY TO ONLY GET INSIDES OF `SOME` FROM A VECTOR OF ...
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Dec 10, 2021 You can use filter_map it only returns the Somes not the Nones. let optvec = vec![Some(1), None, Some(4), None]; let filtered: Vec<i32> = optvec.iter().filter_map(|f| … ...

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