`data.groupBy { it[0] }.mapValues { (_, value) -> value.map { it[1] } }`

# getting-started

[menegatti]

data.groupBy { it[0] }.mapValues { (_, value) -> value.map { it[1] } }

[tipsy]

thanks, this language (and the slack channel) never disappoints

[karelpeeters]

Why not data.groupBy { it[0] }.mapValues { (_, value) -> value[1]}?

[arekolek]

Why not data.groupBy({ it[0] }, { it[1] })? 😉

[karelpeeters]

Even better.

[tipsy]

nice

[tipsy]

that's perfect @arekolek, thanks

[tipsy]

i need the value to be an Array<String> rather than a List<String> though, where do i put that with this approach? 🤔

[kirillrakhman]

put .toTypedArray() at the end of the call

[arekolek]

I guess that would be data.groupBy({ it[0] }, { it[1] }).mapValues { it.value.toList() }

[tipsy]

still more readable i think

[tipsy]

return data.groupBy(
    { it[0] },
    { it[1] }
).mapValues { it.value.toTypedArray() }

[arekolek]

I read that wrong, I thought you needed a list, which it already was 😛

[tipsy]

i wish i needed a list 😄

[menegatti]

@arekolek nice one, I didn't know groupBy took more than one lambda