How to return a vector of strings in rust

Question

How can I return a vector of strings by splitting a string that has spaces in between

fn line_to_words(line: &str) -> Vec<String> {     
    line.split_whitespace().collect()
}
    
fn main() {
    println!( "{:?}", line_to_words( "string with spaces in between" ) );
}

The above code returns this error

line.split_whitespace().collect()
  |                           ^^^^^^^ value of type `std::vec::Vec<std::string::String>` cannot be built from `std::iter::Iterator<Item=&str>`
  |
  = help: the trait `std::iter::FromIterator<&str>` is not implemented for `std::vec::Vec<std::string::String>`

It looks lke you changed your question to a different question, and now the answers don't fit the question anymore. Please use the "Ask Question" button to ask a new question, rather than editing an old question. I'm rolling back your changes. — Sven Marnach
– Sven Marnach, Commented Jul 2, 2020 at 8:35

Michael Anderson · Accepted Answer · 2020-07-02 06:41:21Z

6

If you want to return Vec<String> you need to convert the Iterator<Item=&str> that you get from split_whitespace into an Iterator<Item=String>. One way to convert iterator types is using Iterator::map. The function to convert &str to String is str::to_string. Putting this together gives you

fn line_to_words(line: &str) -> Vec<String> {
    line.split_whitespace().map(str::to_string).collect()
}

answered Jul 2, 2020 at 6:41

Michael Anderson

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2 Comments

rusty Over a year ago

How can I return a result instead of Vec<String> Ex: Result< Vec<String>, InvalidError> > { .... .... }

Sven Marnach Over a year ago

@rusty Just change the return type of the function, and wrap the return value in Ok().

ShadowMitia · Accepted Answer · 2020-07-02 06:41:37Z

2

You're getting an error because split_whitespace returns a &str. I see two options:

return a Vec<&str>
convert the result of split_whitespace by using map(|s| s.to_string())

answered Jul 2, 2020 at 6:41

ShadowMitia

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2 Comments

rusty Over a year ago

How can I return a result instead of Vec<String> Ex: Result< Vec<String>, InvalidError> > { .... .... }

ShadowMitia Over a year ago

You change the return type, and wrap the result in a Ok() see here. Maybe change your question to include this if it's very important.

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