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  1. Avoiding != null statements
  2. How do you check for an empty string in JavaScript?
  3. What is a NullReferenceException, and how do I fix it?
  4. How to determine if variable is 'undefined' or 'null'?
  5. Is there a standard function to check for null, undefined, or blank variables in JavaScript?
  6. Altering a column: null to not null
  7. Why is null an object and what's the difference between null and undefined?
  8. What is the difference between null and undefined in JavaScript?
  9. Which @NotNull Java annotation should I use?
  10. null object in Python?
  11. IllegalArgumentException or NullPointerException for a null parameter?
  12. JavaScript checking for null vs. undefined and difference between == and ===
  13. Should a retrieval method return 'null' or throw an exception when it can't produce the return value?
  14. How do I check for null values in JavaScript?
  15. Why is my Spring @Autowired field null?
  16. How to check for an undefined or null variable in JavaScript?
  17. Which is preferred: Nullable<>.HasValue or Nullable<> != null?
  18. Filtering for empty or NULL names in a queryset
  19. Check if a string is null or empty in XSLT
  20. How can I check if a string is null or empty in PowerShell?
  21. In C#, what happens when you call an extension method on a null object?
  22. Python — return, return None, and no return at all
  23. Check if object exists in JavaScript
  24. Best explanation for languages without null
  25. DateTime “null” value
  26. What is the difference between NULL, '\0' and 0
  27. Checking for a null int value from a Java ResultSet
  28. What is null in Java?
  29. What is the PostgreSQL equivalent for ISNULL()
  30. Why does Oracle 9i treat an empty string as NULL?
  31. Not equal <> != operator on NULL
  32. MySQL: selecting rows where a column is null
  33. How to check if a variable is not null?
  34. Cleaner way to do a null check in C#?
  35. NOT IN clause and NULL values
  36. NULL vs nil in Objective-C
  37. Do you use NULL or 0 (zero) for pointers in C++?
  38. In Objective-C why should I check if self = [super init] is not nil?
  39. How to check null objects in jQuery
  40. When should I use nil and NULL in Objective-C?
  41. How to check if my string is equal to null?
  42. What are the advantages of using nullptr?
  43. Unique ways to use the Null Coalescing operator
  44. JavaScript null check
  45. How to tell if a string is not defined in a bash shell script?
  46. getActivity() returns null in Fragment function
  47. Can I use if (pointer) instead of if (pointer != NULL)?
  48. php is null or empty?
  49. How to set enum to null
  50. Is it good practice to NULL a pointer after deleting it?