Lambda Guide

Lambda

Feature Overview

This feature converts a lambda expression to an anonymous Func.

Check details on R.apex.

Prerequisite

You need to include R.apex if you want to enable this feature.

Sweet Apex Example

public class LambdaDemo {
    public static Func f = (Integer a) -> {
        return a + 1;
    };
}

Transpiled Apex

public class LambdaDemo {
    public static Func f = new AnonymousFunc0(new Sweet.AnonymousContext(null, new Map{  }));

    private class AnonymousFunc0 extends Func {
        private Sweet.AnonymousContext anonymous_context;
        public AnonymousFunc0(Sweet.AnonymousContext context) {
            super(1);
            this.anonymous_context = context;
        }
        public override Object execN(List args) {
            Integer a = args.get(0) == null ? null : (Integer)args.get(0);
            return a + 1;
        }
    }
}
Usage
Lambda expression are like (Type1 name1, Type2 name2) -> { ... }.
We convert lambda expression to anonymous functions.
Here are the things we need to pay attention to:
  • Lambda expressions take this as reference to the enclosing object, not the functions.
  • Nested lambda expressions are supported.
  • You can refer to variables from enclosing block by using outer.Xxx, but this does NOT support nested lambda expressions.
Contribute on Github! Edit this section.