How and when does kotlin let run?

Question

for all the examples on the internet i cant figure out when and how is kotlins let ran? if(phones.size == 0){ phones.add("") } return phones[0] so if phones list size is 0, we add empty string and return that instead. Now how would one do same with let ? phones.let { return "" } does this work with size 0, or do i have to have null list? do i need return keyword, if yes, where? is the above fun always going to return empty string? or just when phones is null? when is this let code block even ran? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Update: val cakes = listOf("carrot", "cheese", "chocolate") fun main(args: Array) { var cakesEaten = 0 while (cakesEaten < 3) { // 1 cakesEaten ++ val result = cakes?.let{ if(cakesEaten == 2) { "HeyLo" } else { 2 } } println("result value = $result") when(result) { is String -> println(" result variable is a String") is Int -> println(" result variable is Integer") } } } result value = 2 result variable is Integer result value = HeyLo result variable is a String result value = 2 result variable is Integer Original post If your 'phones' Object is a Nullable type, val result = phones?.let{ // this block runs only if phones object is not null // items can be accessed like it.size // expression result will be returned. no need to mention return. if(it.size == 0) { it.add("") it[0] } else it.size } result value will be either it[0] or it.size and its type will be Any. But if this the functionality you need you can check Markos solution.