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Chapter 12 tests and exercises
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‎fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/State.java‎

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‎fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_01/Generator.java‎

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package com.fpinjava.state.exercise12_01;
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import com.fpinjava.common.Tuple;
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public class Generator {
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public static Tuple<Integer, RNG> integer(RNG rng) {
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return rng.nextInt();
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}
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public static Tuple<Integer, RNG> integer(RNG rng, int limit) {
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throw new IllegalStateException("To be implemented");
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}
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}

fpinjava-parent/fpinjava-state-solutions/src/main/java/com/fpinjava/state/exercise12_10_/JavaRNG.java renamed to fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_01/JavaRNG.java

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package com.fpinjava.state.exercise12_10_;
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package com.fpinjava.state.exercise12_01;
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import com.fpinjava.common.Tuple;
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fpinjava-parent/fpinjava-state-solutions/src/main/java/com/fpinjava/state/exercise12_03_/RNG.java renamed to fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_01/RNG.java

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package com.fpinjava.state.exercise12_03_;
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package com.fpinjava.state.exercise12_01;
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import com.fpinjava.common.Tuple;

‎fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_02/Generator.java‎

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package com.fpinjava.state.exercise12_02;
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import com.fpinjava.common.List;
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import com.fpinjava.common.Tuple;
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public class Generator {
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public static Tuple<Integer, RNG> integer(RNG rng) {
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return rng.nextInt();
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}
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public static Tuple<Integer, RNG> integer(RNG rng, int limit) {
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Tuple<Integer, RNG> random = rng.nextInt();
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return new Tuple<>(Math.abs(random._1 % limit), random._2);
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}
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public static Tuple<List<Integer>, RNG> integers(RNG rng, int length) {
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throw new IllegalStateException("To be implemented");
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}
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}

fpinjava-parent/fpinjava-state-solutions/src/main/java/com/fpinjava/state/exercise12_03_/JavaRNG.java renamed to fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_02/JavaRNG.java

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package com.fpinjava.state.exercise12_03_;
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package com.fpinjava.state.exercise12_02;
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import com.fpinjava.common.Tuple;
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fpinjava-parent/fpinjava-state-solutions/src/main/java/com/fpinjava/state/exercise12_10_/RNG.java renamed to fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_02/RNG.java

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package com.fpinjava.state.exercise12_10_;
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package com.fpinjava.state.exercise12_02;
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import com.fpinjava.common.Tuple;

‎fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_03/JavaRNG.java‎

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package com.fpinjava.state.exercise12_03;
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import com.fpinjava.common.Tuple;
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import java.util.Random;
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public class JavaRNG implements RNG {
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private final Random random;
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private JavaRNG(long seed) {
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this.random = new Random(seed);
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}
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private JavaRNG() {
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this.random = new Random();
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}
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@Override
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public Tuple<Integer, RNG> nextInt() {
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return new Tuple<>(random.nextInt(), this);
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}
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public static RNG rng(long seed) {
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return new JavaRNG(seed);
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}
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public static RNG rng() {
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return new JavaRNG();
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}
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}

fpinjava-parent/fpinjava-state-solutions/src/main/java/com/fpinjava/state/exercise12_04_/RNG.java renamed to fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_03/RNG.java

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package com.fpinjava.state.exercise12_04_;
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package com.fpinjava.state.exercise12_03;
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import com.fpinjava.common.Tuple;
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public interface RNG {
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Tuple<Integer, RNG> nextInt();
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int limit();
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int length();
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}

‎fpinjava-parent/fpinjava-state-exercises/src/main/java/com/fpinjava/state/exercise12_03/Random.java‎

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package com.fpinjava.state.exercise12_03;
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import com.fpinjava.common.Function;
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import com.fpinjava.common.Tuple;
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public interface Random<A> extends Function<RNG, Tuple<A, RNG>> {
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static <A> Random<A> unit(A a) {
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return rng -> new Tuple<>(a, rng);
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}
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static <A, B> Random<B> map(Random<A> s, Function<A, B> f) {
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return rng -> {
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Tuple<A, RNG> t = s.apply(rng);
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return new Tuple<>(f.apply(t._1), t._2);
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};
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}
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Random<Integer> intRnd = RNG::nextInt;
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Random<Boolean> booleanRnd = null; // To be implemented
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}

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