Callback syntax

Javascript_callback_ver1

// callback executer 
let y = function(doCallBack) {
    console.log("This is dependent function expression which will inquire callback");
    doCallBack(); /* doCallBack parameter defined and executed itself inside dependant function expression ensure callback as argument will be inquired and returned subsequently */
};

// calback ifself
let x = function() {
    console.log('This is the body of independent function expression, which says: "I am callback called as argument"');
};

y(x);