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Common errors in Go and how to fix them

This series of tutorials helps you solve common problems and errors you may encounter when developing Go applications.

1 How to cancel a hanging operation in Go

2 Handling unmarshal JSON with unknown fields in Go

3 Cannot convert []string to []interface {} in Go

4 Fixing Go error: cannot use X (type Y) as type Z in assignment

5 Fixing Go error: nil pointer dereference

6 Fixing Go error: index out of range

7 Fixing Go error: panic: runtime error: invalid memory address or nil pointer dereference

8 Fixing Go error: imported and not used

9 Fixing Go error: declared and not used

10 Fixing Go error: type does not implement interface

11 Fixing Go error: cannot assign to struct field in map

12 Fixing Go error: fatal error: all goroutines are asleep - deadlock!

13 Fixing Go error: missing return

14 Fixing Go error: too many arguments in call to function

15 Fixing Go error: assignment to entry in nil map

16 Fixing Go error: invalid argument for len

17 Fixing Go error: type assertion error

18 Fixing Go error: invalid operation: mismatched types

19 Fixing Go error: invalid memory address or nil pointer dereference

20 Fixing Go error: slice bounds out of range

21 Fixing Go error: division by zero

22 Fixing Go error: duplicate key in map literal

23 Fixing Go error: chan send on closed channel

24 Fixing Go error: chan receive on closed channel

25 Fixing Go error: attempt to close closed channel

26 Fixing Go error: interface conversion: interface is nil, not type

27 Fixing Go error: undefined: variable or package

28 Fixing Go error: cannot use untyped nil in assignment

29 Fixing Go error: no new variables on left side of :=

30 Fixing Go error: use of untyped nil

31 Fixing Go error: unexpected newline, expecting comma or }

32 Fixing Go error: redeclared in this block

33 Fixing Go error: undeclared name: X

34 Fixing Go error: syntax error: unexpected X, expecting Y

35 Fixing Go error: array index must be non-negative integer constant

36 Fixing Go error: assignment mismatch: X variables but Y values

37 Fixing Go error: method has pointer receiver, not called with pointer

38 Fixing Go error: cannot compare X (type Y) with Z (type W)

39 Fixing Go error: assignment to constant variable

40 Fixing Go error: attempted to use nil slice

41 Fixing Go error: copy argument must have slice type

42 Fixing Go error: method redeclared with different receiver type