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kotlinlang

does anyone know if there is a simpler version to do grouping ? like a single selector returning a pair ?
```
val map: Map&lt;String, List&lt;String&gt;&gt; = (0 until versions.length).map { i -&gt;
        val versionNode = versions.item(i)
        val version = versionNode.textContent
        val mcVersion = version.substringBefore('-')
        val forgeVersion = version.substringAfter('-')
        mcVersion to forgeVersion
}.groupBy(
        keySelector = {it.first},
        valueTransform = {it.second}
)
```

but that would result in a list of pairs right ? and would require another step to turn it into a map
what i want is a `Map&lt;String, List&lt;String&gt;&gt;`

(0 until 100).fold(mutableMapOf&lt;String, List&lt;String&gt;&gt;()) { acc, i -&gt;
            val mcVersion = i.toString()
            val forgeVersion = (i * 2).toString()
            acc.also {
                it[mcVersion] = (it[mcVersion] ?: listOf()) + listOf(forgeVersion)
            }
        }