Blank
Testing for blank
A blank String is a String that is meets at least one of the following criteria:
null
zero length
only contains whitespace
isBlank
String isBlank(String? string)
The isBlank returns true if ANY ONE of the above criteria holds true
String.isBlank(null);
-> true
String.isBlank('');
-> true
String.isBlank('\t\n\r ');
-> true
String.isBlank('a');
-> false
isNotBlank
String isNotBlank(String? string)
The isNotBlank returns true only if ALL of the above criteria are invalid
String.isNotBlank(null);
-> false
String.isNotBlank('');
-> false
String.isNotBlank('\t\n\r ');
-> flase
String.isNotBlank('a');
-> true
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