How to use "Schedule Once"

[bonsai]

※Paris version

I'm aiming for script concurrency using "Schedule Once".

I understand how to use it as follows,
I don't understand how it works.

function script(argument){
    //ScheduleJob
    gs.info(argument);
} 
var argument ="Test OK"
var sched = new ScheduleOnce();
sched.script = '('+script+')("'+argument+'");';
sched.schedule();

I wondered if "script" should be a string in the "'(' + script +')" part, but why specify the function name?

I'm learning a script so please let me know.

[Hitoshi Ozawa]

Working example of ScheduleOnce.

Following example will update user to be active.

Script Include:

var UpdateUserActiveFlg = Class.create();
UpdateUserActiveFlg.prototype = {
    initialize: function() {},
    updateUser2Active: function(argument) {
        var gr = new GlideRecord('sys_user');
        gr.addQuery('sys_id', argument);
        gr.query();
        if (gr.next()) {
            gr.active = true;
            gr.update();
        }
    },
    type: 'UpdateUserActiveFlg'
};

Script using ScheduleOnce

var argument ="62826bf03710200044e0bfc8bcbe5df1";  // sample sys_id of user to set active
var sched = new ScheduleOnce();
sched.script = "var si = new UpdateUserActiveFlg().updateUser2Active('" + argument + "');";
sched.schedule();

[Hitoshi Ozawa]

BTW, the script in the question would return an error because it's missing a semi-colon after

var argument ="Test OK";

[Hitoshi Ozawa · Accepted solution]

Re-read the original question.

No, "script" should not be a string. It's a function.

For example, following code will call the function named "script" immediately.

function script(argument){
    //ScheduleJob
    gs.info(argument);
}
var argument ="Test OK"
(script)(argument);

As such, in sched.script, it's necessary to pass the function named "script" (i.e. the content of the function) and not the entire definition of the function including "function script(argument)) {".

sched.script = '('+script+')("'+argument+'");';

That is, 

sched.script = 'gs.info("test ok");';

and not this,

sched.script = 'function script(){gs.info("test ok");}';

[bonsai]

thank you for your answer.
And thank you for correcting the code mistake.

I learned that specifying a function name = passing the contents of a function! !!

By the way, I still don't understand why I need to pass the contents of the function. ..

Is it the specification of "Schedule Once"?