Typescript:
import fs from "fs";
const fileName = process.argv[2];
if (fileName) {
fs.readFileSync(fileName)
.toString()
.split("\n")
.map((num) => parseInt(num, 10))
.forEach((line) => {
if (isNaN(line)) {
console.log("not a number");
} else {
console.log(line);
}
});
}
Rust:
fn main() {
let filename = std::env::args().nth(1).expect("the file name is required");
let file = std::fs::read_to_string(filename).expect("unable to read the file");
file.lines().for_each(|line| {
if let Ok(value) = line.parse::<usize>() {
println!("{}", value);
} else {
println!("{} is not a number", line);
}
});
}