Using Kotlin Extension Functions: The Good, the Bad, and the Ugly | HackerNoon

My name is Viacheslav Aksenov. I am a professional Java/Kotlin backend developer in one of the largest Russian Fintech companies. I am responsible for designing and developing microservices for internal employees.In this article, I want to explain how to use the Kotlin extension functions the right way.Extension functions in Kotlin allow you to natively implement the "decorator" pattern.

private static final String getFormattedAmount { return "Account " + $this$getFormattedAmount.getId + " stores " + $this$getFormattedAmount.getAmount; } In this way, there is an extension with a signature that tells everybody from outside that this function just converts some class to another. But inside there is a lot of calls third-party APIs. It can be ambiguous for anybody who reads the code where this extension is using.

data class OwnClass { // public method is good! fun someMethod: String { // some logic } } // extension is very bad! fun OwnClass.someMethod: String=//some logicfun OwnClass.someMethod: { val metaField1=thirdPartyClient.getMetaField1 val metaField2=thirdPartyClient.getMetaField2 val metaField2=thirdPartyClient.getMetaField2 if { val metaField=.... // ... } // ... }

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