是否可以这样做:
/**
* Converts all of the characters in the string to upper case.
*
* @param str the string to be converted to uppercase
* @return the string converted to uppercase or empty string if the input was null
*/
fun String?.toUpperCase(): String = this?.toUpperCase() ?: ""
- 这会怎么样？这将使
toUpperCase个零安全. - 我有什么问题？返回值为
this?.toUpperCase()，
Is the only option to rename my extension function or is there a way to refer to the "super" function from within it?