KtUtil/pers.shawxingkwok.ktutil/getOrPutNullable

getOrPutNullable

inline fun <T, V> MutableMap<T, V>.getOrPutNullable(key: T, getValue: (T) -> V): V

Solves the nullability bug of MutableMap.getOrPut.

Usage example:

var map = mutableMapOf("a" to null, "b" to 1)
map.getOrPut("a"){ 2 } // 2
map                    // {a=2, b=1}

map = mutableMapOf("a" to null, "b" to 1)
map.getOrPutNullable("a"){ 2 } // null
map                            // {a=null, b=1}