Today I Learned

From this

$('.multiSelectOne').multiselect({
    buttonClass: 'btn btn-default',
    buttonWidth: '100%',
    ...
});
$('.multiSelectTwo').multiselect({
    buttonClass: 'btn btn-default',
    buttonWidth: '100%',
    nonSelectedText: '---',
    ...
});

To This

<select class="js-multiselect" 
    data-include-select-all-option="true" 
    data-all-selected-text="All">
    <option></option>
</select>

$('.js-multi-select).each(function () {
	let options = {};
  
	Object.entries($(this).data())
		.map(property => options[property[0]] = property[1]);
    
  $(this).multiselect(options); 

}

And never go back for adjustments in the script file ever again.