CODEWITHSUNDEEP
stringvectorrust
rusty
rusty

Reputation: 161

How to return a vector of strings in rust

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>`

Upvotes: 8

Views: 10302

Answers (2)

ShadowMitia
ShadowMitia

Reputation: 2533

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())

Upvotes: 2

Michael Anderson
Michael Anderson

Reputation: 73590

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()
}

Upvotes: 6

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