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Are they the same? I can sometimes see the documentation use them as if they were equal.
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Type Option represents an optional value: every Option is either Some and contains a value, or None , and does not. Option types are very common in Rust code, as they have a number of uses: Initial values. Return values for functions that are not defined over their entire input range (partial functions)
Rust provides safety guarantees by forcing us at compile-time, via Some / None , to always deal with the possibility of None being returned. Follow this answer to receive notifications.
To check if an Option is None you can either use Option::is_none or use the if let syntax. or if x == None .
You can unpack Option s by using match statements, but it's often easier to use the ? operator. If x is an Option , then evaluating x? will return the underlying value if x is Some , otherwise it will terminate whatever function is being executed and return None .
The Option type is defined as:
enum Option<T> {
None,
Some(T),
}
Which means that the Option type can have either a None or a Some value.
See also:
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