In Python I can write:

for i, element in enumerate(my_list): print i # the index, starting from 0 print element # the list-element

How can I write this in Kotlin?

2 Answers

Iterations in Kotlin: Some Alternatives

Like already said, forEachIndexed is a good way to iterate.

Alternative 1

The extension function withIndex, defined for Iterable types, can be used in for-each:

val ints = arrayListOf(1, 2, 3, 4, 5)
for ((i, e) in ints.withIndex()) { println("$i: $e")
}

Alternative 2

The extension property indices is available for Collection, Array etc., which let's you iterate like in a common for loop as known from C, Java etc:

for(i in ints.indices){ println("$i: ${ints[i]}")
}

1

There is a forEachIndexed function in the standard library:

myList.forEachIndexed { i, element -> println(i) println(element)
}

See @s1m0nw1's answer as well, withIndex is also a really nice way to iterate through an Iterable.

0

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