null 411

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