jQuery loop slice

I am trying to truncate the characters of some sections that are automatically generated.
While I can see that it does the job on the console, it doesn’t appear on the website (https://help.peeba.com/hc/zh-tw)

My code:

if ($(location.href.indexOf("zh-tw") > -1) || (location.href.indexOf("zh-cn"))) {

  var str = $('.p-article-description').text();
  var res = str.slice(0, 48);
  $('.p-article-description').each(
    function(i, v) {
      $('.p-article-description').slice(0, 40);

  });
}

Any ideas?

Thanks

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