We can use first, last and step properties of a range to find the first, the last value or the step of a range. We will cover: Overview of conditions and loops in Kotlin Using if with else in Kotlin conditional expressions Using when with else in Kotlin conditional expressions Kotlin for loops while and do. The function until() can be used to create a range but it will skip the last element given. B - Kotlin range can be created using the rangeTo() and downTo() functions or. The function reversed() can be used to reverse the values of a range. A - Kotlin range is a sequence of values defined by a start, an end, and a step. Ranges can be created for characters like we have created them for integer values. Let's have a look at the following example: Example We can use step() function to define the distance between the values of the range. The good news is that Kotlin can help us avoid this kind of error because it's a null safe language. These happen whenever you try to call a method or read a property of an object reference which is null. If we want to define a backward range we can use the downTo operator: Example Nullability If you're an Android coder, you must have come across the infamous NullPointerException errors in your app. So the above code can be re-written using. The rangeTo() is often called in its operator form. confusing Kotlin: For-loop range must have an iterator() method for nullable collection Duplicates 1 issue (0 unresolved) Subtask of 1 issue (1 unresolved). When you run the above Kotlin program, it will generate the following output: To create a Kotlin range we call rangeTo() function on the range start value and provide the end value as an argument. Exampleġ.10 // Range of integers starting from 1 to 10Ī.z // Range of characters starting from a to zĪ.Z // Range of capital characters starting from A to Zīoth the ends of the range are always included in the range which means that the 1.4 expression corresponds to the values 1,2,3 and 4. The main operation on ranges is contains, which is usually used in the form of in and !in operators. Kotlin ranges are created with rangeTo() function, or simply using downTo or (.) operators. Kotlin range is defined by its two endpoint values which are both included in the range.
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