Github user takuti commented on a diff in the pull request:
https://github.com/apache/incubator-hivemall/pull/110#discussion_r135446415
--- Diff: core/src/main/java/hivemall/utils/lang/StringUtils.java ---
@@ -172,12 +172,17 @@ public static void clear(@Nonnull final StringBuilder
buf) {
public static String concat(@Nonnull final List<String> list, @Nonnull
final String sep) {
--- End diff --
@myui I guess you originally assumed this method behaves in a similar way
to [what `org.apache.commons.lang3.StringUtils.join`
does](https://github.com/apache/commons-lang/blob/1571050a196198f336ae487ee3b6df629d3ee9da/src/main/java/org/apache/commons/lang3/StringUtils.java#L4106-L4150).
However, the original code appends a separator even at the end of result
string as:
- expected: `concat(["a", "b", "c"], "-")` => `a-b-c`
- actual: `concat(["a", "b", "c"], "-")` => `a-b-c-`
So, I fixed the method in 796d388c36c520858b6e61deb34100cb9201e5fa. Is this
okay? If my assumption was incorrect, I revert the modification and introduce
alternative method `StringUtils.join()`.
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