<Best way to sum all values of a SparseIntArray> W...

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Best way to sum all values of a SparseIntArray
What is the best way to sum all the values of a SparseIntArray in Kotlin ?

I try something but it's not working...
This is my code (quantities is the SparseIntArray) :

var amount = 0
for (q in quantities){
amount += q
}


But I have this error :

For loop range must have an 'iterator()' method


Be careful : my problem don't concern ArrayList but SparseIntArray.