How to add last or past orders in the cart in shopify. Add this liquid code under snippets folder

repeat-order.liquid

{% if order.line_items.size > 0 %}
  <p>
    <button class="btn place-same-order">Add order to cart</button>
    <script>
      (function(){
        /* Check for the button */
        var buttonOrder = document.getElementsByClassName('place-same-order') || false;
        if(!buttonOrder){ return }
        /* Setup the order object. Extend this as needed. */
        var order = {
          items:[
            {% for line_item in order.line_items %}
              {
                variant_id: {{ line_item.variant.id | json }},
                product_id: {{ line_item.product.id | json }},
                properties: {{ line_item.properties | json }},
                available: {{ line_item.variant.available | json }}
              }{% unless forloop.last %},{% endunless %}
            {% endfor %}
          ]
        };
        /* Simple function to check the queue */
        var checkQueue = function(){
          order.items.shift();
          if(order.items.length){
            orderItems()
          }else{
            window.location.href = '/cart';
          }
        };
        /* Simple function add to cart */
        var orderItems = function(){
          if(!order.items.length){ return }
          if(!order.items[0].available){ 
            checkQueue();
          }
          var request = new XMLHttpRequest();
          request.open('post', '/cart/add.js', true);
          request.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
          request.onload = function() {
            var resp = request.responseText;
            if (request.status >= 200 && request.status < 400) {
              checkQueue();
            } else { /* add your error handling in here */ }
          };
          request.onerror = function() {
            /* add your error handling in here */
          };
          request.send(JSON.stringify({
            'quantity':order.items[0].quantity,
            'id':order.items[0].variant_id
          }));
          
        };
        buttonOrder[0].addEventListener("click", function (event) {
          event.preventDefault();
          /* Get the button we just clicked */
          var t = event.target || event.srcElement;
          /* Very simple method to stop a double click. You should make something fancier. */
          t.setAttribute('disabled','disabled');
          t.innerHTML = 'Adding to cart...';
          /* Fire the function that adds to cart */
          orderItems();
        });
      })();
    </script>
  </p>
{% endif %}