Nasal Hello World

In the programming world, a "Hello, World!" program is used to illustrate basic syntax using a very simple program. The "Hello, World!" program in Nasal would look like this (run this in the Nasal Console):

print("Hello, World!");

This will print the string Hello, World! into the console.

To show a message inside the FlightGear window using a GUI tooltip instead, use the following snippet:

gui.popupTip("Hello, World!");

To use a Canvas GUI dialog, try the following:

# create a new InputDialog with a title, label, and a callback
canvas.InputDialog.getText("Hello World", "Please enter your name", func(btn,value) {
    if (value) gui.popupTip("You entered: "~value);
});