Seach an array of itens for a value and show/hide itens based on ID

js-search.js

$('.js-chat-search').on('keyup', function(){
  var s = $(this).val();
  if(s != ""){
    $('.js-chat-item').hide();
    for (var j = 0; j < userList.length; j++) {
      if (userList[j][0].toUpperCase().match(s.toUpperCase())){
        $('.js-chat-item-'+userList[j][1]).show();
      }
    }
  }else{
    $('.js-chat-item').show();
  }
});