ju_tcs_rust_23_23/
lib.rs

1use std::{path::Path, fs::File};
2use std::io::{self,BufRead};
3
4pub fn head(path: &Path, n: usize) -> Vec<String> {
5    let file = File::open(path);
6    let lines = io::BufReader::new(file.unwrap()).lines();
7    
8    let mut res: Vec<String> = vec![];
9    let mut i = n;
10    for line in lines {
11        if i == 0 { break; }
12        
13        res.push(line.unwrap());
14        i -= 1;
15    }
16
17    res
18}
19
20pub fn tail(path: &Path, n: usize) -> Vec<String> {
21    let file = File::open(path);
22    let mut lines: Vec<Result<String,std::io::Error>> = io::BufReader::new(file.unwrap()).lines().collect();
23    lines.reverse();
24
25    let mut res: Vec<String> = vec![];
26    let mut i = n;
27    for line in lines {
28        if i == 0 { break; }
29        
30        res.push( line.unwrap() );
31
32        i-=1;
33    }
34
35    res.reverse();
36    res
37}
38
39
40#[cfg(test)]
41mod tests {
42    #[test]
43    fn test_math() {
44        assert_eq!(1 + 2, 3);
45    }
46}
ju_tcs_rust_23_23/lib.rs

ju_tcs_rust_23_23/
lib.rs
