September 2019
Intermediate to advanced
462 pages
11h 3m
English
Content preview from Programming Kotlin
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Range and Iteration
Imagine telling someone to count from one to five by uttering “set i equal to 1 but while keeping i less than 6, increment i and report the value.” If we had to communicate with a fellow human that way, it would have ended civilization a long time ago. Yet that’s how programmers have been writing code in many C-like languages. But we don’t have to, at least not in Kotlin.
Range Classes
Kotlin raises the level of abstraction to iterate over a range of values with specialized classes. For instance, here’s a way to create a range of numbers from 1 to 5.
| | val oneToFive: IntRange = 1..5 |
The type IntRange, which is part of the kotlin.ranges package, is provided for clarity, but you may leave it out and let ...
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