[jira] [Closed] (LANG-1078) -1, 0 or error for String/Array operations

["Duncan Jones (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-1078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duncan Jones closed LANG-1078.
------------------------------
       Resolution: Not A Bug
         Assignee: Duncan Jones
    Fix Version/s:     (was: Discussion)

I would suggest any further discussion is continued on the developer mailing list.

> -1, 0 or error for String/Array operations
> ------------------------------------------
>
>                 Key: LANG-1078
>                 URL: https://issues.apache.org/jira/browse/LANG-1078
>             Project: Commons Lang
>          Issue Type: Wish
>          Components: lang.*
>            Reporter: haiyang li
>            Assignee: Duncan Jones
>
> what're design insights for below implementation:
> #1: SHOULD throw exception for negative index?
> {code:title= org.apache.commons.lang3.ArrayUtils.java|borderStyle=solid}
>     public static int indexOf(final boolean[] array, final boolean valueToFind, int startIndex) {
>         if (ArrayUtils.isEmpty(array)) {
>             return INDEX_NOT_FOUND;
>         }
>         if (startIndex < 0) {
>             startIndex = 0;
>         }
>         for (int i = startIndex; i < array.length; i++) {
>             if (valueToFind == array[i]) {
>                 return i;
>             }
>         }
>         return INDEX_NOT_FOUND;
>     }
> {code}
> #2, Why does StringUtils.indexOf("", "")  return 0, not -1?
> first of all, "" is an empty String. '0' index doesn't exist in "". secondly, both null and "" strings are considered as none. I think it's inappropriate to say we found a none thing in position 0. so I suggest to return -1(not exists) to the index of any string in a null or "" string or null or "" empty string in any thing.
> (i read the java doc and a few jira tickets. but didn't find the discussion related to this kind of issue. so i created a new ticket).



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