learning_java_lambdas.md

path	title
/learnings/java_lambdas	Learnings: Java: Lambdas

Table Of Contents

• >
  • Restrictions:
  • >
• Book Recommendations

<<Learning_Java_Lambdas>>

Useful interfaces:

• Predicate p = (in) -> false

• BinaryOperator p = (T one, T two) -> two (All must be of same type)

  https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html

Restrictions:

<<Java_Lambda_Outside_Variable_Restrictions>>

1. Variables used in lambda must be final or effectively final - no reassigning values / no __block syntax

<<Learning_Java_Lambdas_Single_Abstract_Interface>>

If you have some Java code like so

interface ThisCallable {
    void doIt(int c);
}


class Example {
    void higherOrderFunction(ThisCallable x) {
    ...
    }
}

Since ThisCallable is a Java Single Abstract Method Interface Java 8+ - will figure it out if you just pass a lambda (in either language)

Book Recommendations

• Java 8 Lambdas