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Articles tagged with #kotlin-beginner
keys and values are both user-defined maps. so for retrieving a value, key should be provided as an argument of the get() function. The shorthand [key] syntax is also supported. If key is not found, null is returned. There is one more different func...
union() function merge two collections into one. It is in the infix form a union b. Order of the operands is important. In the resulting collection, the elements of the first operand comes before the second: val numbers = setOf("one hundred", "two...
List Operations If the list size is less than the specified index, an exception is thrown. However two functions can avoid such exception.getOrElse():It calculate the default value to return if the index is absent in the collection.getOrNull(): retu...
Collection write support operations for changing the collection contents, for example, adding or removing elements. Adding elements To add a single element to a collection, use the add() function. fun main() { val c1 = mutableListOf(5,6,7,8) ...
fold(): fold() takes an initial value and applies a given operation to each element of the collection, accumulating the result. It requires an initial value to start the accumulation process. Example: Calculating the sum of elements with ...
Operation which returns a single value depends upon collection content is known as aggregate function, present in Kotlin collections. minOrNull() and maxOrNull() return the smallest and the largest element respectively. However On empty collections, ...
