rustHow to iterate lines in file in Rust

Iterating lines in a file in Rust is a simple task. The std::fs::File type provides a lines method which returns an iterator over the lines of the file. The following example code reads a file line by line and prints each line to the console:

use std::fs::File;
use std::io::{BufRead, BufReader};

fn main() {
    let file = File::open("my_file.txt").unwrap();
    let reader = BufReader::new(file);

    for line in reader.lines() {
        println!("{}", line.unwrap());
    }
}

Output example

Line 1
Line 2
Line 3

Code explanation

1. use std::fs::File: imports the File type from the std::fs module.
2. let file = File::open("my_file.txt").unwrap(): opens the file my_file.txt and stores the result in the file variable. The unwrap method is used to handle any errors that may occur.
3. let reader = BufReader::new(file): creates a BufReader from the file variable.
4. for line in reader.lines(): iterates over the lines of the reader variable.
5. println!("{}", line.unwrap()): prints each line to the console. The unwrap method is used to handle any errors that may occur.

Helpful links

• std::fs::File
• std::io::BufRead

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