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Merged
mperry merged 1 commit into from
Jan 31, 2015
Merged

Reviewed examples shown on the website for java 8 #103

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16 changes: 5 additions & 11 deletions demo/src/main/java/fj/demo/Array_exists.java
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@@ -1,20 +1,14 @@
package fj.demo;

import fj.F;
import fj.data.Array;
import static fj.data.Array.array;
import static fj.data.List.fromString;
import static fj.function.Characters.isLowerCase;

public final class Array_exists {
public static void main(final String[] args) {
final Array<String> a = array("Hello", "There", "what", "DAY", "iS", "iT");
final boolean b = a.exists(new F<String, Boolean>() {
public Boolean f(final String s) {
return fromString(s).forall(isLowerCase);
}
});
final boolean b2 = a.exists(s -> fromString(s).forall(isLowerCase));
System.out.println(b); // true ("what" provides the only example; try removing it)
}
public static void main(final String[] args) {
final Array<String> a = array("Hello", "There", "what", "DAY", "iS", "iT");
final boolean b = a.exists(s -> fromString(s).forall(isLowerCase));
System.out.println(b); // true ("what" is the only value that qualifies; try removing it)
}
}
12 changes: 6 additions & 6 deletions demo/src/main/java/fj/demo/Array_filter.java
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import static fj.function.Integers.even;

public final class Array_filter {
public static void main(final String[] args) {
final Array<Integer> a = array(97, 44, 67, 3, 22, 90, 1, 77, 98, 1078, 6, 64, 6, 79, 42);
final Array<Integer> b = a.filter(even);
final Array<Integer> c = a.filter(i -> i % 2 == 0);
arrayShow(intShow).println(b); // {44,22,90,98,1078,6,64,6,42}
}
public static void main(final String[] args) {
final Array<Integer> a = array(97, 44, 67, 3, 22, 90, 1, 77, 98, 1078, 6, 64, 6, 79, 42);
final Array<Integer> b = a.filter(even);
final Array<Integer> c = a.filter(i -> i % 2 == 0);
arrayShow(intShow).println(b); // {44,22,90,98,1078,6,64,6,42}
}
}
19 changes: 9 additions & 10 deletions demo/src/main/java/fj/demo/Array_foldLeft.java
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Expand Up @@ -6,15 +6,14 @@
import static fj.function.Integers.add;

public final class Array_foldLeft {
public static void main(final String[] args) {
final Array<Integer> a = array(97, 44, 67, 3, 22, 90, 1, 77, 98, 1078, 6, 64, 6, 79, 42);
final int b = a.foldLeft(add, 0);
public static void main(final String[] args) {
final Array<Integer> a = array(97, 44, 67, 3, 22, 90, 1, 77, 98, 1078, 6, 64, 6, 79, 42);
final int b = a.foldLeft(add, 0);

// WARNING: In JDK 8, update 20 and 25 (current version) the following code triggers an internal JDK compiler error, likely due to https://bugs.openjdk.java.net/browse/JDK-8062253. The code below is a workaround for this compiler bug.
// final int c = a.foldLeft(i -> (j -> i + j), 0);
F<Integer, F<Integer, Integer>> add2 = i -> (j -> i + j);
final int c = a.foldLeft(add2, 0);

System.out.println(b); // 1774
}
// WARNING: In JDK 8, update 20 and 25 (current version) the following code triggers an internal JDK compiler error, likely due to https://bugs.openjdk.java.net/browse/JDK-8062253. The code below is a workaround for this compiler bug.
// final int c = a.foldLeft(i -> (j -> i + j), 0);
F<Integer, F<Integer, Integer>> add2 = i -> (j -> i + j);
final int c = a.foldLeft(add2, 0);
System.out.println(b); // 1774
}
}
16 changes: 5 additions & 11 deletions demo/src/main/java/fj/demo/Array_forall.java
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package fj.demo;

import fj.F;
import fj.data.Array;
import static fj.data.Array.array;
import static fj.data.List.fromString;
import static fj.function.Characters.isLowerCase;

public final class Array_forall {
public static void main(final String[] args) {
final Array<String> a = array("hello", "There", "what", "day", "is", "it");
final boolean b = a.forall(new F<String, Boolean>() {
public Boolean f(final String s) {
return fromString(s).forall(isLowerCase);
}
});
final boolean b2 = a.forall(s -> fromString(s).forall(isLowerCase));
System.out.println(b); // false ("There" is a counter-example; try removing it)
}
public static void main(final String[] args) {
final Array<String> a = array("hello", "There", "what", "day", "is", "it");
final boolean b = a.forall(s -> fromString(s).forall(isLowerCase));
System.out.println(b); // false ("There" is a counter-example; try removing it)
}
}
1 change: 0 additions & 1 deletion demo/src/main/java/fj/demo/Array_map.java
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package fj.demo;

import fj.data.Array;

import static fj.data.Array.array;
import static fj.function.Integers.add;
import static fj.Show.arrayShow;
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1 change: 0 additions & 1 deletion demo/src/main/java/fj/demo/List_map.java
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package fj.demo;

import fj.data.List;

import static fj.data.List.list;
import static fj.function.Integers.add;
import static fj.Show.intShow;
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58 changes: 30 additions & 28 deletions demo/src/main/java/fj/demo/Option_bind.java
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import fj.F;
import fj.data.Option;
import static fj.data.Option.none;
import static fj.data.Option.some;
import static fj.Show.intShow;
import static fj.Show.optionShow;
import static fj.data.Option.none;
import static fj.data.Option.some;

public final class Option_bind {
public static void main(final String[] args) {
final Option<Integer> o1 = some(7);
final Option<Integer> o2 = some(8);
final Option<Integer> o3 = none();
final Option<Integer> p1 = o1.bind(new F<Integer, Option<Integer>>() {
public Option<Integer> f(final Integer i) {
return i % 2 == 0 ? some(i * 3) : Option.<Integer>none();
}
});
final Option<Integer> p2 = o2.bind(new F<Integer, Option<Integer>>() {
public Option<Integer> f(final Integer i) {
return i % 2 == 0 ? some(i * 3) : Option.<Integer>none();
}
});
final Option<Integer> p3 = o3.bind(new F<Integer, Option<Integer>>() {
public Option<Integer> f(final Integer i) {
return i % 2 == 0 ? some(i * 3) : Option.<Integer>none();
}
});
public static void main(final String[] args) {
final Option<Integer> o1 = some(7);
final Option<Integer> o2 = some(8);
final Option<Integer> o3 = none();

F<Integer, Option<Integer>> f = i -> i % 2 == 0 ? some(i * 3) : none();
final Option<Integer> o4 = o1.bind(f);
final Option<Integer> o5 = o2.bind(f);
final Option<Integer> o6 = o3.bind(f);

final Option<Integer> p4 = o1.bind(i -> i % 2 == 0 ? some(i * 3) : Option.<Integer>none());
final Option<Integer> p5 = o2.bind(i -> i % 2 == 0 ? some(i * 3) : Option.<Integer>none());
final Option<Integer> p6 = o3.bind(i -> i % 2 == 0 ? some(i * 3) : Option.<Integer>none());
final Option<Integer> p1 = o1.bind(new F<Integer, Option<Integer>>() {
public Option<Integer> f(final Integer i) {
return i % 2 == 0 ? some(i * 3) : Option.<Integer>none();
}
});
final Option<Integer> p2 = o2.bind(new F<Integer, Option<Integer>>() {
public Option<Integer> f(final Integer i) {
return i % 2 == 0 ? some(i * 3) : Option.<Integer>none();
}
});
final Option<Integer> p3 = o3.bind(new F<Integer, Option<Integer>>() {
public Option<Integer> f(final Integer i) {
return i % 2 == 0 ? some(i * 3) : Option.<Integer>none();
}
});

optionShow(intShow).println(p1); // None
optionShow(intShow).println(p2); // Some(24)
optionShow(intShow).println(p3); // None
}
optionShow(intShow).println(o4); // None
optionShow(intShow).println(o5); // Some(24)
optionShow(intShow).println(o6); // None
}
}
35 changes: 19 additions & 16 deletions demo/src/main/java/fj/demo/Option_filter.java
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@@ -1,27 +1,30 @@
package fj.demo;

import fj.F;
import fj.data.Option;
import static fj.Show.intShow;
import static fj.Show.optionShow;
import static fj.data.Option.none;
import static fj.data.Option.some;
import static fj.function.Integers.even;
import static fj.Show.intShow;
import static fj.Show.optionShow;

public final class Option_filter {
public static void main(final String[] args) {
final Option<Integer> o1 = some(7);
final Option<Integer> o2 = none();
final Option<Integer> o3 = some(8);
final Option<Integer> p1 = o1.filter(even);
final Option<Integer> p2 = o2.filter(even);
final Option<Integer> p3 = o3.filter(even);
public static void main(final String[] args) {
final Option<Integer> o1 = some(7);
final Option<Integer> o2 = none();
final Option<Integer> o3 = some(8);

final Option<Integer> o4 = o1.filter(even);
final Option<Integer> o5 = o2.filter(even);
final Option<Integer> o6 = o3.filter(even);

final Option<Integer> p4 = o1.filter(i -> i % 2 == 0);
final Option<Integer> p5 = o1.filter(i -> i % 2 == 0);
final Option<Integer> p6 = o1.filter(i -> i % 2 == 0);
F<Integer, Boolean> f = i -> i % 2 == 0;
final Option<Integer> o7 = o1.filter(f);
final Option<Integer> o8 = o1.filter(f);
final Option<Integer> o9 = o1.filter(i -> i % 2 == 0);

optionShow(intShow).println(p1); // None
optionShow(intShow).println(p2); // None
optionShow(intShow).println(p3); // Some(8)
}
optionShow(intShow).println(o4); // None
optionShow(intShow).println(o5); // None
optionShow(intShow).println(o6); // Some(8)
}
}
24 changes: 12 additions & 12 deletions demo/src/main/java/fj/demo/Option_map.java
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package fj.demo;

import fj.data.Option;
import static fj.Show.intShow;
import static fj.Show.optionShow;
import static fj.data.Option.none;
import static fj.data.Option.some;
import static fj.function.Integers.add;
import static fj.Show.intShow;
import static fj.Show.optionShow;

public final class Option_map {
public static void main(final String[] args) {
final Option<Integer> o1 = some(7);
final Option<Integer> o2 = none();
final Option<Integer> p1 = o1.map(add.f(42));
final Option<Integer> p2 = o2.map(add.f(42));
public static void main(final String[] args) {
final Option<Integer> o1 = some(7);
final Option<Integer> o2 = none();
final Option<Integer> p1 = o1.map(add.f(42));
final Option<Integer> p2 = o2.map(add.f(42));

final Option<Integer> p3 = o1.map(i -> i + 42);
final Option<Integer> p4 = o2.map(i -> i + 42);
final Option<Integer> p3 = o1.map(i -> i + 42);
final Option<Integer> p4 = o2.map(i -> i + 42);

optionShow(intShow).println(p1); // Some(49)
optionShow(intShow).println(p2); // None
}
optionShow(intShow).println(p1); // Some(49)
optionShow(intShow).println(p2); // None
}
}