- Kotlin 小窍门
- null + null in Kotlin
- Deduplicating collection items
- The suspend and inline mystery
- Unshadowing declarations with their fully qualified name
- Return and throw with the Elvis operator
- Destructuring declarations
- Operator functions with nullable values
- Timing code
- Improving loops
- Strings
- Doing more with the Elvis operator
- Kotlin collections
- 下一步做什么?
Kotlin 小窍门
Kotlin Tips is a series of short videos where members of the Kotlin team show how to use Kotlin in a more efficient and idiomatic way to have more fun when writing code.
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null + null in Kotlin
What happens when you add null + null
in Kotlin, and what does it return? Sebastian Aigner addresses this mystery in our latest quick tip. Along the way, he also shows why there’s no reason to be scared of nullables:
YouTube 视频:Kotlin Tips: null + null in Kotlin
Deduplicating collection items
Got a Kotlin collection that contains duplicates? Need a collection with only unique items? Let Sebastian Aigner show you how to remove duplicates from your lists, or turn them into sets in this Kotlin tip:
YouTube 视频:Kotlin Tips: Deduplicating Collection Items
The suspend and inline mystery
How come functions like repeat(), map() and filter() accept suspending functions in their lambdas, even though their signatures aren’t coroutines-aware? In this episode of Kotlin Tips Sebastian Aigner solves the riddle: it has something to do with the inline modifier:
YouTube 视频:Kotlin Tips: The Suspend and Inline Mystery
Unshadowing declarations with their fully qualified name
Shadowing means having two declarations in a scope have the same name. So, how do you pick? In this episode of Kotlin Tips Sebastian Aigner shows you a simple Kotlin trick to call exactly the function that you need, using the power of fully qualified names:
YouTube 视频:Kotlin Tips: Unshadowing Declarations
Return and throw with the Elvis operator
Elvis has entered the building once more! Sebastian Aigner explains why the operator is named after the famous singer, and how you can use ?:
in Kotlin to return or throw. The magic behind the scenes? The Nothing type.
YouTube 视频:Kotlin Tips: Return and Throw with the Elvis Operator
Destructuring declarations
With destructuring declarations in Kotlin, you can create multiple variables from a single object, all at once. In this video Sebastian Aigner shows you a selection of things that can be destructured – pairs, lists, maps, and more. And what about your own objects? Kotlin’s component functions provide an answer for those as well:
YouTube 视频:Kotlin Tips: Destructuring Declarations
Operator functions with nullable values
In Kotlin, you can override operators like addition and subtraction for your classes and supply your own logic. But what if you want to allow null values, both on their left and right sides? In this video, Sebastian Aigner answers this question:
YouTube 视频:Kotlin Tips: Operator Functions With Nullable Values
Timing code
Watch Sebastian Aigner give a quick overview of the measureTimedValue() function, and learn how you can time your code:
YouTube 视频:Kotlin Tips: Timing Code
Improving loops
In this video, Sebastian Aigner will demonstrate how to improve loops to make your code more readable, understandable, and concise:
YouTube 视频:Kotlin Tips: Improving Loops
Strings
In this episode, Kate Petrova shows three tips to help you work with Strings in Kotlin:
YouTube 视频:Kotlin Tips: Strings
Doing more with the Elvis operator
In this video, Sebastian Aigner will show how to add more logic to the Elvis operator, such as logging to the right part of the operator:
YouTube 视频:Kotlin Tips: The Elvis Operator
Kotlin collections
In this episode, Kate Petrova shows three tips to help you work with Kotlin Collections:
YouTube 视频:Kotlin Tips: Kotlin Collections
下一步做什么?
- See the complete list of Kotlin Tips in our YouTube playlist
- Learn how to write idiomatic Kotlin code for popular cases