ayago

import java.util.function.Function;

import static java.lang.String.format;

class Scratch {
    public static void main(String[] args) {
        //instantiate as an object
        Function<Integer, String> stringifyInteger = stringifyInteger();
        System.out.println(format("Output is %s", stringifyInteger.apply(3)));

ayago

import java.math.BigDecimal;
import java.util.function.Function;

import static java.lang.String.format;

class ComposingFunctions {

    public static void main(String[] args) {
        
        Function<BigDecimal, Integer> asInteger = a -> a.intValue();

ayago

import java.util.function.Function;

import static java.lang.String.format;

class SamplePartialApplication {

    public static void main(String[] args) {

        Fx2<Integer, Integer, Integer> add = (x, y) -> x + y;
        System.out.println(format("Fully applied function of 2 arity result: %s", add.apply(2, 3)));

ayago

import java.util.function.Function;

import static java.lang.String.format;

class HigherOrderFunctions {

    public static void main(String[] args) {

        Function<Integer, Integer> addOne = describeOperationFor(1);
        Function<Integer, Integer> multiplyOne = a -> a * 1;

ayago

import java.util.function.Function;

import static java.lang.String.format;

class SampleCurrying {

    public static void main(String[] args) {

        Fx2<Integer, Integer, Integer> add = (x, y) -> x + y;
        System.out.println(format("Non curried add function of 2 arity result: %s", add.apply(2, 3)));

ayago

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import static java.lang.String.format;
import static java.util.Arrays.asList;

class SampleFolding {

ayago

import java.math.BigDecimal;
import java.util.function.Function;

import static java.lang.String.format;

class SampleLazyEvaluation {

    public static void main(String[] args) {

        Function<String, BigDecimal> asBigDecimal = BigDecimal::new;

ayago

import lombok.AllArgsConstructor;
import lombok.Getter;

import java.math.BigDecimal;
import java.util.function.Function;

import static java.lang.String.format;

class SampleTuples {

ayago

import java.util.List;
import java.util.function.Function;

import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toList;

/**
 * A Monad like construct (e.g. {@code Optional}) that handles
 * whether the operation is successful or not
 */

ayago

import java.util.function.Function;

/**
 * AKA function monad
 * @param <R> values to be passed
 * @param <A> resulting value upon application of instance of R
 */
public final class Reader<R, A> {

    private final Function<R, A> g;