JSFiddle - React, Tailwind, and code Playground

HTML

<button id="btn-0">Click</button>
<button id="btn-1">Click</button>
<button id="btn-2">Click</button>
<button id="btn-3">Click</button>

JavaScript

var arr = [
    [0],
    [1],
    [2],
    [3]
];
for (var i = 0; i < arr.length; i++) {
    (function (n) {
        $('#btn-' + i).click(function () {
            console.log(n);
        });
    })(i);
}