Is there a simple way to get a array from a object list in Kotlin?

Question

I hope to get a name array from a list of MSetting, at present, I use Code A to do it, but it's too complex, is there a simple way to do it?

Code A

  fun getName(aList:List<MSetting>): Array<CharSequence>{
        if (aList.isEmpty()){
            return emptyArray<CharSequence>()
        }else{
            var aa=Array<CharSequence>(aList.size,{""})
            for (index in aList.indices){
                aa[index]=aList[index].name
            }
            return aa
        }
    }

Data

data class MSetting (
        var _id: Long,  
        var name: String,
        var createdDate: Long,
        var description: String
)

zsmb13 · Accepted Answer · 2018-06-01 03:58:14Z

13

The solution here is using map and then toTypedArray:

fun getName(aList: List<MSetting>): Array<CharSequence> {
    return aList.map { it.name }.toTypedArray()
}

answered Jun 1, 2018 at 3:58

zsmb13

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Comments

GianhTran · Accepted Answer · 2018-06-01 03:39:08Z

7

using map operator

var names = msettings.map { it -> it.name}

names is a list content all value of name from msettings

hope this helps

edited Jun 1, 2018 at 3:39

answered Jun 1, 2018 at 3:29

GianhTran

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2 Comments

Adil Over a year ago

Hey @gianhtran is there any other method instead of map?

GianhTran Over a year ago

well kotlin have a lot of method using for collection, depend on your purpose . you can see here kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/…

Ashish Chaugule · Accepted Answer · 2020-01-09 11:00:08Z

2

map work for me

val names = list.map { it.name }

answered Jan 9, 2020 at 11:00

Ashish Chaugule

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