What stdlib function turns `foo` into `bar`? ```v...

# getting-started

[Hullaballoonatic]

What stdlib function turns foo into bar?

val foo = listOf(
  'a' to 1,
  'a' to 2,
  'b' to 3
)

val bar = mapOf(
  'a' to listOf(1, 2),
  'b' to listOf(3)
)

UPDATE: I found the answer

fun <T, K, V> Iterable<T>.groupBy(
    keySelector: (T) -> K,
    valueTransform: (T) -> V
): Map<K, List<V>>

[Andy Gibel]

foo.associateBy{} ?

[Hullaballoonatic]

that returns Map<Char, Int> instead of the desired Map<Char, List<Int>>

[Dominaezzz]

foo.groupBy { it.first }?

[Hullaballoonatic]

that returns Map<Char, List<Pair<Char, Int>>>

[Hullaballoonatic]

i think it's just associate

[Hullaballoonatic]

nope, that doesn't do it

[Hullaballoonatic]

oh, it's

foo.groupBy({ it.first }, { it.second })

[Andy Gibel]

nice!

[Andy Gibel]

I was going down the road of reduce lol