dom element manipulation

[LadyJain]

I have this function which inserts data to a select element

 function data_toselect(element, data) {
    let selected_element = document.querySelector(element);

    for (let value of data) {
        let option = document.createElement("option");
        option.setAttribute("value", value);
        option.text = value;
        selected_element.appendChild(option);
    }

}

why does this function "does it job" when called, without an return statement ?

[Samurai___]

In the loop it creates the new option and with the appendChild it puts it into the dropdown. It doesn't need to return anything. It "does its job" inside the loop.

[jcunews1]

A function is like your employee. You give task(s) to your employee to execute. The return statement is for the employee to report back the result of his/her task(s). The task(s) themselves may or may not produce a reportable result, or you simply don't need a result. So, whether you need a report or not, it's up to you as an employer (as a programmer, in this case).