refactor

by Dmitry Morar

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" class="cat" value="1">


<button class="plus">+</button>
<button class="minus">-</button>

JavaScript

this.stepUpAmountInput = function() {
    let inputAmount = $('.cat');
    let quantity = parseInt(inputAmount.val(), 10);
    let productUnit = 1;

    inputAmount.val(quantity + productUnit);
  };

  this.stepDownAmountInput = function() {
    let inputAmount = $(this.attr.inputAmount);
    let quantity = parseInt(inputAmount.val(), 10);
    let productUnit = 1;

    if (quantity > productUnit) {
      inputAmount.val(quantity - productUnit);
    }
  };