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https://issues.apache.org/jira/browse/LANG-1078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250223#comment-14250223
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haiyang li commented on LANG-1078:
----------------------------------
Thanks, Duncan
A bit more about the java document. As an user, i like the java doc written in
Commons Lang because it's helpful, However, from the aspect of the design, I
hope the API could be straight forward, instead of trying to make everything(no
matter right/wrong) running. so I prefer to concise APIs with less docs if it's
possible.
Right, i hope this kind of thing is included in the consideration in the design
of version 4 and that's why i created the ticket.
> -1, 0 or error for String/Array opereations
> -------------------------------------------
>
> Key: LANG-1078
> URL: https://issues.apache.org/jira/browse/LANG-1078
> Project: Commons Lang
> Issue Type: Wish
> Reporter: haiyang li
> Fix For: Discussion
>
>
> 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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