How to get index of an array element in click event with JavaScript

I'm developing an Electron App, and for this specific part of the code, it's necessary that I recover the index of the current element (on click).

HTML:

<div>
    <input type="checkbox" class="optionBox"> Minimize to tray after 10 seconds
    <input type="checkbox" class="optionBox"> Always check day transition
</div>

JavaScript:

modifierCheckboxes = document.querySelectorAll('.optionBox');

for (var i = 0; i < modifierCheckboxes.length; i++) {
    modifierCheckboxes[i].addEventListener('click', function (e) {
        bindModifierCheckBoxes(e);
    });
}

function bindModifierCheckBoxes(e) {
    // I need the reference for modifierCheckboxes[i] here 
}

I've tried this:

function bindModifierCheckBoxes(e){
    var t=e.target;
    console.log(Array.prototype.indexOf.call(t.parentNode.childNodes,t));
}

It came "close", but when I click on the first checkbox, I get index of 1, and in the second one I get 3.

Please, no external libraries, just plain JavaScript.

Maybe you can convert the Object selector to an array and then you can use an indexOf.

var checks = document.querySelectorAll('.optionBox');

checks.forEach(function(check){
  check.addEventListener('click', checkIndex);
})

function checkIndex(event){
  console.log( Array.from(checks).indexOf(event.target) );
}