Permissible for a map to contain itself as a value, extreme caution isĪdvised: the equals and hashCode methods are no longerĪll general-purpose map implementation classes should provide two Is not permissible for a map to contain itself as a key.

A special case of this prohibition is that it The behavior of a map is not specified if the value of an object isĬhanged in a manner that affects equals comparisons while the Note: great care must be exercised if mutable objects are used as map

Specific guarantees as to their order others, like the HashMap Some map implementations, like the TreeMap class, make The order in which the iterators on the map's collection views return theirĮlements. The Map interface provides three collection views, whichĪllow a map's contents to be viewed as a set of keys, collection of values, Was a totally abstract class rather than an interface. This interface takes the place of the Dictionary class, which It is like an Function approach towards the traditional for-loop way.īoth For loops and ForEach are same when generating output from an array or listįorEach can be more useful if we use it more functional operators.An object that maps keys to values. This will also print the same output like before,Īs you can see that using forEach inplace to for loop make the code more concise and smart.įorEach are used to perfrom action on each and every elements of list Now, in Kotlin we can perform the same operation using ForEach So, if we want to print all the item in the list using for loop, we will use Let's Consider an example, we want to print all the elements in a list But before that let's understand how for loop works. In this blog, we will talk about the ForEach function in Kotlin. We can also use while loops.įor loops are used to get each and evey elements of the Collection, List. Have you ever have iterated through a list or an array in Kotlin or in any programming language ? For loops are traditionally used to do this type of jobs.

Kotlin list foreach