Parser - Map from comma separated pairs, in Kotlin

parseCommaDelimitedMap.kt

fun parseCommaDelimitedMap(str: String): Map<String, String> {
    if (str == null)  return null

    val pairs = str.split(',').map { it.trim() }.filter { it.contains(':') }
        .map {
            val parts = it.split(':', limit = 2)
            Pair(parts[0], parts[1])
        }
        .associate { it }
    return pairs
}