[Axios]

Нашел ответ:

var course = [course1, course2, course3, course4, course5, course6, course7, course8, course9, course10, course11, course12, course13, course14, course15, course16, course17, course18, course19, course20, course21, course22, course23, course24, course25, course26];

var optionsarray = course;
var seloption = "";
$.each(optionsarray,function(i){
    seloption += '<option value="'+optionsarray[i]+'">'+optionsarray[i]+'</option>'; 
});
$('#type_course').append(seloption);