rust type cheat sheet

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// To inner type
unwrap () -> T
unwrap_or (T) -> T
unwrap_or_else (() -> T) -> T
unwrap_or_default () -> T where T: Default
expect (&str) -> T

//Converting to another type
map ((T) -> U) -> Option<U>
map_or (U, (T) -> U) -> U
map_or_else (() -> U, (T) -> U) -> U

// To Result
ok_or (E) -> Result<T, E>
ok_or_else (() -> E) -> Result<T, E>

//Conditioning
filter ((&T) -> bool) -> Option<T>
and (Option<U>) -> Option<U>
and_then ((T) -> Option<U>) -> Option<U>
or (Option<T>) -> Option<T>
or_else (() -> Option<T>) -> Option<T>
xor (Option<T>) -> Option<T>

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// Cloning inner
cloned () -> Option<T> where T: Clone
copied () -> Option<T> where T: Copy

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flatten () -> Option<T>

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transpose () -> Result<Option<T>, E>

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// Checking inner
is_some () -> bool
is_none () -> bool

//To inner reference
as_ref () -> Option<&T>
iter () -> Iterator<&T>
as_deref () -> Option<&U>  where T: Deref<Target = U>