regularberry

class MutableClass {
    var val: Int?
    
    init(val: Int = 0) {
        self.val = val
    }
    
    func update(newVal: Int) {
        val = nil
        val = newVal

regularberry

dict["first"] = .some(nil)
if let val = dict["first"] {
    print(val)
}
// prints ‘nil’

regularberry

var dict: [String: Any?] = ["first": nil, "second": 2]

if let val = dict["first"] {
    print(val)
}
// Output: nil

dict["first"] = nil
if let val = dict["first"] {
    print(val)

regularberry

override fun onBindViewHolder(holder: ViewHolder,
                              position: Int,
                              payloads: MutableList<Any>) {
    if (!payloads.isEmpty()) {
        // Because these updates can be batched,
        // there can be multiple payloads for a single bind
        when (payloads[0]) {
            Payload.FAVORITE_CHANGE -> {
                // Change only the "favorite" icon,
                // leave background image alone: