$("#merge_button").click(function(event){

    event.preventDefault();

    var searchIDs = $("#find-table input:checkbox:checked").map(function(){

      return $(this).val();

    }).get(); // <----

    console.log(searchIDs);

});

​

$('#checkbox_id:checked').val();

//if checkbox is selected than gets its value

let weekdays = $('input[name="weekday"]:checked').map(function () {

  return $(this).val()

}).get()

$("#submit").click(function(event){

    event.preventDefault();

    var value = $("#id_name_div input:checkbox:checked").map(function(){

      return $(this).val();

    }).get();

    console.log(value);

});

$('input[name="checkboxGroup"]:checked');  // returns checked input objects

$(":checkbox[value=4]").prop("checked","true");

​