kinow commented on a change in pull request #812:
URL: https://github.com/apache/commons-lang/pull/812#discussion_r753025643
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File path: src/main/java/org/apache/commons/lang3/StringUtils.java
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@@ -3930,11 +3930,15 @@ public static String join(final boolean[] array, final
char delimiter, final int
if (endIndex - startIndex <= 0) {
return EMPTY;
}
- final StringJoiner joiner = newStringJoiner(delimiter);
+ final StringBuilder stringBuilder = new StringBuilder();
for (int i = startIndex; i < endIndex; i++) {
- joiner.add(String.valueOf(array[i]));
+ stringBuilder
+ .append(array[i])
+ .append(delimiter);
}
- return joiner.toString();
+ return stringBuilder
+ .deleteCharAt(stringBuilder.length() - 1)
+ .toString();
Review comment:
Interesting, I thought instead of `deleteChartAt` using an `if`
statement in the `for` above, to avoid adding the last `delimiter` would
improve more the performance. For a follow-up discussion I think.
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