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Prettier Java 2.5: Java 21 unnamed patterns and variables preview feature!

· 2 min read

This release adds support for the Java 21 preview feature: unnamed patterns and variables (JEP 443)!

Highlights​

Support Java 21 preview feature: unnamed patterns and variables (#620 by @jtkiesel)​

We’ve added support for the Java 21 preview feature "Unnamed Patterns and Variables":

Unnamed pattern variables​

// Example
r instanceof Point _

Unnamed variables​

// Example
int acc = 0;
for (Order _ : orders) {
  if (acc < LIMIT) {
    // ... acc++ ...
  }
}

Other Changes​

New entrypoint lexAndParse to return both tokens and CST (#625 by @max-schaefer)​

Provide an entrypoint that exposes both the CST and the underlying token array.

No longer ignore whole block when prettier-ignore at start (#603 by @jtkiesel)​

When a block begins with // prettier-ignore, only the first statement is ignored, rather than the whole block.

// Input
void foo() {
  // prettier-ignore
  var bar = List.of(
    1
  );

    var baz = 2;
}

// Prettier Java 2.4
void foo() {
  // prettier-ignore
  var bar = List.of(
    1
  );

    var baz = 2;
}

// Prettier Java 2.5
void foo() {
  // prettier-ignore
  var bar = List.of(
    1
  );

  var baz = 2;
}