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pub trait VecString{
fn vec_string(&self) -> String;
fn vec_string_inner(&self) -> String;
}
impl<T> VecString for Vec<T> where T: std::fmt::Display{
fn vec_string(&self) -> String{
format!("[{}]", self.vec_string_inner())
}
fn vec_string_inner(&self) -> String{
let mut string = String::new();
for x in self{
string.push_str(&format!("{}, ", x));
}
string.pop();
string.pop();
string
}
}
#[cfg(test)]
mod tests {
use crate::VecString;
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
#[test]
fn test() {
assert_eq!("[1, 2, 3]", vec![1, 2, 3].vec_string());
assert_eq!("1, 2, 3", vec![1, 2, 3].vec_string_inner());
}
}