TrailingComma.md

Pattern: Missing trailing comma

Issue: -

Description

Checks whether list and map literals contain optional trailing comma. Rationale: Putting this comma in makes is easier to change the order of the elements or add new elements on the end.

Property	Description	Default Value
checkList	To disable checking List literals, set this property to false	true
checkMap	To disable checking Map literals, set this property to false	true

This is valid code:

  int[] array1 = [] // one line declaration
  int[] array2 = [ // empty list
             ]
  int[] array3 = [1,2,3] // one line declaration
  int[] array4 = [1,
              2,
              3, // contains trailing comma
             ]

Example of violations:

  int[] array2 = [1,
              2 // there is no trailing comma
             ]

Further Reading

• CodeNarc - TrailingComma