how to convert list of pairs to a map grouped by o...

# getting-started

[Steven Wang]

how to convert list of pairs to a map grouped by one component e.g. second?

`listOf("A" to 1, "B" to 2, "C" to 1)` to `mapOf(1 to listOf("A", "C"), 2 to listOf("B"))`

[allan.conda]

use groupBy

[Joris PZ]

listOf("A" to 1, "B" to 2, "C" to 1).groupBy( { it.second}, { it.first})

[Steven Wang]

Thanks @Joris PZ, yeah! Just figured it out by following @allan.conda’s pointer