Question
What is the correct method to convert an `IntArray` to an `ArrayList<Int>` in Kotlin?
val array = intArrayOf(5, 3, 0, 2, 4, 1, 0, 5, 2, 3, 1, 4)
Answer
In Kotlin, converting an `IntArray` to an `ArrayList<Int>` can be accomplished with a couple of simple steps. It involves first converting the `IntArray` to a standard array, and then creating an `ArrayList` from that standard array.
val intArray = intArrayOf(5, 3, 0, 2, 4, 1, 0, 5, 2, 3, 1, 4)
val arrayList: ArrayList<Int> = ArrayList(intArray.toList())
Causes
- Understanding the difference between `IntArray` and other array types in Kotlin.
- The method `toTypedArray()` only converts `IntArray` to `Array<Int>`, not directly to `ArrayList<Int>`.
- Not using the appropriate constructor or collection function available in Kotlin.
Solutions
- Use the `asList()` method in combination with `ArrayList` to efficiently convert.
Common Mistakes
Mistake: Using `toTypedArray()` expecting it will return an `ArrayList<Int>` directly.
Solution: Use `toList()` followed by `ArrayList()` constructor to create the desired ArrayList.
Mistake: Not initializing the `ArrayList` correctly.
Solution: Ensure you create the `ArrayList` properly from a collection obtained from the `IntArray`.
Helpers
- Kotlin IntArray conversion
- Array to ArrayList Kotlin
- convert IntArray to ArrayList<Int>
- Kotlin collection conversion