An asynchronous operation executes in a thread, separate from the main application thread. When an application calls a method to perform an operation asynchronously, the application can continue executing while the asynchronous method performs its task.
import ‘dart:io’;
void main() {
print(“Enter your name :”);
// prompt for user input
String name = stdin.readLineSync();
// this is a synchronous method that reads user input
print(“Hello Mr. ${name}”);
print(“End of main”);
}
The readLineSync() is a synchronous method. This means that the execution of all instructions that follow the readLineSync() function call will be blocked till the readLineSync() method finishes execution.
The stdin.readLineSync waits for input. It stops in its tracks and does not execute any further until it receives the user’s input.
The above example will result in the following output −
Enter your name :
Tom
// reads user input
Hello Mr. Tom
End of main