AdapterClass.kt

class CourseAdapter(private val viewModel: CourseViewModel) :
    ListAdapter<Course, ViewHolder>(CourseDiffCallback()) {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        return ViewHolder(inflater.inflate(R.layout.course_item, parent, false))
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bind(viewModel, getItem(position))
    }

    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun bind(viewModel: CourseViewModel, course: Course) {
            with(itemView) {
                courseTitle.text = course.courseTitle
                courseThumbnail.loadImage(course.thumbnail)
                modules.text = GeneralUtil.getNumber(course.numberOfModules, "Module")
                courseLessons.text = GeneralUtil.getNumber(course.numberOfLessons, "Lesson")
                startCourse.setOnClickListener {
                    viewModel.openCourseModule(
                        course.id,
                        course.courseTitle,
                        course.numberOfLessons
                    )
                }
            }
        }
    }
}