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'copy' method of data class is called without named arguments

Reports calls to a data class' copy() method without named arguments.

As all arguments of the copy() function are optional, it might be hard to understand what properties are modified. Providing parameter names explicitly makes code easy to understand without navigating to the data class declaration.

Example:

data class User(val name: String, val age: Int) fun copyUser(user: User): User { return user.copy("John") }

The quick-fix provides parameter names to all copy() arguments:

data class User(val name: String, val age: Int) fun copyUser(user: User): User { return user.copy(name = "John") }

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Kotlin, 241.16690-IJ

Last modified: 29 April 2024