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<button data-operation="sub">-</button>
<input type="number" value="0">
<button data-operation="add">+</button>
///////////////////////////////////////
const input = $('input');
$('[data-operation]').click(function() {
const { operation } = $(this).data();
input.val((_, cur) => +cur + (operation === "add" ? 1 : -1));
});
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