How to check in Apex if a Text field is blank

I’m unsure what’s the shortest and most robust way to check whether a Text field is blank / empty?

/*1*/ Boolean isBlank = record.txt_Field__c == '';
/*2*/ Boolean isBlank = record.txt_Field__c == null;
/*3*/ Boolean isBlank = record.txt_Field__c.trim() == '';
/*4*/ Boolean isBlank = record.txt_Field__c.size() == 0;

Answer

I use the isBlank(String) method on the string class in order to check whether a string is either null, white space or empty.

String.isBlank(record.txt_Field__c);

The documentation says:

Returns true if the specified String is white space, empty (”), or null; otherwise, returns false.

Attribution
Source : Link , Question Author : Robert Sösemann , Answer Author : Robert Sösemann

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