Kotlin extensions for Android: How to use bundleOf

Question

Documentation says:

fun bundleOf(vararg pairs: Pair<String, Any?>): Bundle

Returns a new Bundle with the given key/value pairs as elements.

I tried:

   val bundle = bundleOf {
       Pair("KEY_PRICE", 50.0)
       Pair("KEY_IS_FROZEN", false)
   }

But it is showing error.

Answer 1

If it takes a vararg, you have to supply your arguments as parameters, not a lambda. Try this:

val bundle = bundleOf(
               Pair("KEY_PRICE", 50.0),
               Pair("KEY_IS_FROZEN", false)
             )

Essentially, change the { and } brackets you have to ( and ) and add a comma between them.

Another approach would be to use Kotlin's to function, which combines its left and right side into a Pair. That makes the code even more succinct:

val bundle = bundleOf(
    "KEY_PRICE" to 50.0,
    "KEY_IS_FROZEN" to false
)

Answer 2

How about this?

val bundle = bundleOf (
   "KEY_PRICE" to 50.0,
   "KEY_IS_FROZEN" to false
)

to is a great way to create Pair objects. The beauty of infix function with awesome readability.