Command line progress bar in Groovy

progress-bar.groovy

int spaces = 20
int progress = 100

(progress + 1).times {
    // String * int is a shortcut to repeat string that many times
    String hash = "#" * Math.ceil((it*spaces)/100.0);
    
    // Carraige return (\r) returns the cursor to first character in line, overwriting other characters
    print(String.format("[%-" + spaces + "s] %d%s\r", hash, it, '%'))
    
    // Wait for 100 milli seconds to seem like an animation
    Thread.sleep(100)
}