Reading from Stdin

Reading interactive input means waiting for a line of text that ends with Enter. Node.js has the readline/promises module so you can await the answer, Go uses a bufio.Reader that reads up to the newline character, Rust reads through io::stdin().read_line(), Swift has a built-in global readLine() function, and Java 25 has IO.readln(prompt) — printing the prompt and reading a line in a single call.

Reading a line from stdin

import { createInterface } from 'node:readline/promises'
 
const rl = createInterface({ input: process.stdin, output: process.stdout })
 
const name = await rl.question('Enter name: ')
console.log('Your name is: ' + name)
 
rl.close()

package main
 
import (
	"bufio"
	"fmt"
	"os"
	"strings"
)
 
func main() {
	reader := bufio.NewReader(os.Stdin)
	fmt.Print("Enter name: ")
 
	text, err := reader.ReadString('\n')
	if err != nil {
		panic(err)
	}
 
	name := strings.TrimSpace(text)
	fmt.Printf("Your name is: %s\n", name)
}

use std::io::{self, Write};
 
fn main() {
    print!("Enter name: ");
    io::stdout().flush().unwrap(); // print! doesn't auto-flush, so flush before reading
 
    let mut name = String::new();
    io::stdin().read_line(&mut name).unwrap();
    let name = name.trim(); // read_line keeps the trailing '\n'
 
    println!("Your name is: {name}");
}

print("Enter name: ", terminator: "")
let name = readLine() ?? ""
print("Your name is: \(name)")

void main() {
    String name = IO.readln("Enter name: ");
    IO.println("Your name is: " + name);
}

Enter name: bob
Your name is: bob