Android kotlin Arraylist of objects get specific value

Question

I have ArrayList and i want to get him some specific object values and insert them to another ArrayList, but I can't get the specific values

val listA = ArrayList<User>()

this list contains some users with their id,name, and email so i need to get all user's whose names are john and id,email will be any value

listA.filter { it.name == "john" }

Tenfour04
– Tenfour04

2019-12-29 21:36:04 +00:00
Commented Dec 29, 2019 at 21:36 — Tenfour04
– Tenfour04, Commented Dec 29, 2019 at 21:36
Thank you, please post it as an answer to help the others

ismacil jama
– ismacil jama

2019-12-29 22:09:16 +00:00
Commented Dec 29, 2019 at 22:09 — ismacil jama
– ismacil jama, Commented Dec 29, 2019 at 22:09

Mayokun · Accepted Answer · 2019-12-29 22:17:07Z

4

You could use the filter function i.e

listA.filter { it.name == "john" }

or use groupBy with forEach i.e

listA.groupBy{ it.name }.forEach{name, list ->

//name: the key for each list according to their names
//list: a grouped list according to the names

}

answered Dec 29, 2019 at 22:17

Mayokun

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1 Comment

ismacil jama Over a year ago

Thank you, the groupBy is saves me, the second solution

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