Remove data from list while iterating kotlin

Issue

I am new to kotlin programming. What I want is that I want to remove a particular data from a list while iterating through it, but when I am doing that my app is crashing.

for ((pos, i) in listTotal!!.withIndex()) {

            if (pos != 0 && pos != listTotal!!.size - 1) {

                if (paymentsAndTagsModel.tagName == i.header) {
                    //listTotal!!.removeAt(pos)
                    listTotal!!.remove(i)
                }



            }
        }

OR

 for ((pos,i) in listTotal!!.listIterator().withIndex()){
            if (i.header == paymentsAndTagsModel.tagName){
                listTotal!!.listIterator(pos).remove()
            }

        }

The exception which I am getting

java.lang.IllegalStateException

Solution

It's forbidden to modify a collection through its interface while iterating over it. The only way to mutate the collection contents is to use Iterator.remove.

However using Iterators can be unwieldy and in vast majority of cases it's better to treat the collections as immutable which Kotlin encourages. You can use a filter to create a new collections like so:

listTotal = listTotal.filterIndexed { ix, element ->
    ix != 0 && ix != listTotal.lastIndex && element.header == paymentsAndTagsModel.tagName
}

Answered By - miensol