Created
March 23, 2022 12:28
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Coursera-kotlin extension function lexture
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| fun main(args: Array<String>) { | |
| val s1: String? = null | |
| val s2: String? = "" | |
| s1.isEmptyOrNull() eq true | |
| s2.isEmptyOrNull() eq true | |
| val s3 = " " | |
| s3.isEmptyOrNull() eq false | |
| } | |
| fun String?.isEmptyOrNull() = (this == null || this.isEmpty) |
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isEmptyOrNull()
Add and implement an extension function 'isEmptyOrNull()' on the type String?. It should return true, if the string is null or empty.