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++ ) {
    $('#btn-' + i).click(function() {
        console.log(i);
    });    
}