higherorderfunctions.py

class Animal:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __repr__(self):
        return self.name


animals = [
    Animal("t-rex", 3e6),
    Animal("dog", 5),
    Animal("cat", 6),
    Animal("ostrichhhhhhhhh", 16),
]

def minus_these_two(a1, a2):
    return a1.age - a2.age

def sort_by_this(animal):
    return animal.age

animals.sort(key=sort_by_this)
print animals

HigherOrderFunctionsTest.java

import java.util.*;

class Animal { // implements Comparable<Animal> {
    public String name;
    public int age;

    public Animal(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String toString() {
        return this.name;
    }

    // @Override
    // public int compareTo(Animal o) {
    //     return this.age - o.age;
    // }
}

class AnimalComparatorAge implements Comparator<Animal> {
    @Override
    public int compare(Animal a1, Animal a2) {
        return a1.age - a2.age;
    }
}

public class HigherOrderFunctionsTest {
    public static void main(String[] args) {
        ArrayList<Animal> animals = new ArrayList<Animal>();
        for (Animal animal : new Animal[] {
                new Animal("t-rex", 3000000),
                new Animal("dog", 5),
                new Animal("cat", 6),
                new Animal("ostrichhhhhhhhh", 16),
        }) {
            animals.add(animal);
        }

        Collections.sort(animals, new AnimalComparatorAge());
        System.out.println(animals);
    }
}

solution to things.md

http://cl.ly/0P3R3n22242R/CS61B_Spring2015_MT1.pdf