> in kotlin

I have a Collection of certain Object in Kotlin, and I'd like to map objects that have a common value in one of their attributes, I've tried using the Collenction utilities from K,android,performance,dictionary,collections,kotlin"/>

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I have a Collection of certain Object in Kotlin, and I'd like to map objects that have a common value in one of their attributes, I've tried using the Collenction utilities from K

android - 转换列表 to Map> in kotlin

I have a Collection of certain Object in Kotlin, and I'd like to map objects that have a common value in one of their attributes, I've tried using the Collenction utilities from K

问题描述

I have a Collection of certain Object in Kotlin, and I'd like to map objects that have a common value in one of their attributes, I've tried using the Collenction utilities from Kotlin, but can't find a way to get a List as the value for a certain key, is this possible without too much code?

Basically, what I need is to get this: List --> Map> Where the String key is a value from a certain property of the Object.

Thanks in advance!

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标签： androidperformancedictionarycollectionskotlin

解决方案

I believe groupBy does just the sort of thing you're looking for.

collection.groupBy { x -> x.getKey() }

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