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Function as argument

Normal function​

function my() {
    console.log("from my function")
}

my();

function can be stored in variable​

let my = function() {
    console.log("my my function")
}

my();

so that, function can be passed as argument​

let my = function () {
  console.log("from my function");
};

function anotherFun(arg1) {
  console.log("from anotherFun");
  arg1();
}

anotherFun(my);

//from anotherFun
//from my function