Expression can be folded into Stream chain

Reports expressions with a repeating pattern which could be replaced with Stream API or String.join().

Example:

boolean allStartWith(String a, String b, String c, String d, String prefix) {
  return a.startsWith(prefix) && b.startsWith(prefix) && c.startsWith(prefix) && d.startsWith(prefix);
}

After the quick-fix is applied:

boolean foo(String a, String b, String c, String d, String prefix) {
  return Stream.of(a, b, c, d).allMatch(s -> s.startsWith(prefix));
}

Example:

String joinAll(String a, String b, String c, String d) {
  return a + "," + b + "," + c + "," + d;
}

After the quick-fix is applied:

String joinAll(String a, String b, String c, String d) {
  return String.join(",", a, b, c, d);
}

This inspection only reports if the language level of the project or module is 8 or higher.

New in 2018.2

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023