Assignment to lambda parameter

Reports assignment to, or modification of lambda parameters. Although occasionally intended, this construct may be confusing and is often caused by a typo or use of a wrong variable.

The quick-fix adds a declaration of a new variable.

Example:

list.forEach(s -> {
  s = s.trim();
  System.out.println("String: " + s);
});

After the quick-fix is applied:

list.forEach(s -> {
  String trimmed = s.trim();
  System.out.println("String: " + trimmed);
});

Use the Ignore if assignment is a transformation of the original parameter option to ignore assignments that modify the parameter value based on its previous value.

Inspection options

Option	Type	Default
Ignore if assignment is a transformation of the original parameter	Checkbox	false

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

Last modified: 13 July 2023