Hot code reloading

module main
import time
import os
[live]
fn print_message() {
    println('Hello! Modify this message while the program is running.')
}
fn main() {
    for {
        print_message()
        time.sleep_ms(500)
    }
}

Build this example with v -live message.v.

Functions that you want to be reloaded must have [live] attribute before their definition.

Right now it’s not possible to modify types while the program is running.

More examples, including a graphical application: github.com/vlang/v/tree/master/examples/hot_code_reload.