JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="a" />
<br>
<input type="text" id="b" />
<br>
<input type="text" id="c" />
<br>
<input type="text" id="d" />
<br>
<input type="text" id="e" />
<br>
<input type="text" id="f" />
<br>
<input type="text" id="g" />
<br>
<button id="btn">Calcluate</button>

JavaScript

$.fn.any = function (evaluator) {
    var items = $(this);
    for (var i = 0; i < items.length; i++) {
        if (evaluator(items[i]) === true) {
            return true;
        }
    }

    return false;
};

function isEmpty(input) {
    return input.value === "";
}

$("#btn").click(function () {

    if ($("input").any(isEmpty)) {
        alert("At least one input is empty.");
    } else {
        alert("No inputs are empty.");
    }
});