calling a self executing function
also look
other patterns

"use strict";
.....
.....
$(function() {	//start when DOM ready
    let msg = "";
    msg += "self executing function<br/>";

    var sFuncVar = (function sFunc(MSG) {
        msg += MSG;
        return sFunc;
        })("self executing function running<br/>");
     
     sFuncVar("calling self executing function<br/>");    
   
    document.getElementById('place').innerHTML =  msg;
})