Higher Order Functions Hall of Fame Assignment

Code To Implement

FilterHof

filter

class:	Hof.java
methods:	filter
package:	hof.util.exercise
source folder:	src/main/java

public static <E> ImList<E> filter(Predicate<E> predicate, ImList<E> list) 

SML List filter

FilterHofClients

class:	FilterHofClients.java
methods:	filterWordsWhichContainAllVowels filterEvens
package:	hof.filter.client.exercise
source folder:	src/main/java

public static ImmutableList<String> filterWordsWhichContainAllVowels(ImmutableList<String> words)

public static ImmutableList<Integer> filterEvens(ImmutableList<Integer> xs)

FoldHof

class:	Hof.java
methods:	foldLeft foldRight
package:	hof.util.exercise
source folder:	src/main/java

foldLeft

public static <E, R> R foldLeft(BiFunction<E, R, R> f, R acc, ImList<E> list) {{HofHof}}

:<code>foldLeft(f, initial_value, [x1, x2, ..., xn])</code>
:returns <code>f(xn,...,f(x2, f(x1, initial_value))...)</code> or <code>initial_value</code> if the list is empty.

[https://smlfamily.github.io/Basis/list.html#SIG:LIST.foldl:VAL SML List foldl] 

===foldRight===
 <nowiki>public static <E, R> R foldRight(BiFunction<E, R, R> f, R acc, ImList<E> list) 

foldRight(f, initial_value, [x1, x2, ..., xn])

returns f(x1, f(x2, ..., f(xn, init)...)) or initial_value if the list is empty.

SML List foldr

Fold Clients

class:	FoldHofClients.java
methods:	sum countBetweenMinAndMaxExclusive
package:	hof.map.client.exercise
source folder:	src/main/java

sum

public static int sum(ImmutableList<Integer> xs)

countBetweenMinAndMaxExclusive

public static int countBetweenMinAndMaxExclusive(int min, int maxExclusive, ImmutableList<Integer> xs)

MapHof

map

class:	Hof.java
methods:	map
package:	hof.util.exercise
source folder:	src/main/java

public static <E, R> ImList<R> map(Function<E, R> f, ImList<E> list) 

SML List map

MapHofApps

class:	MapHofApps.java
methods:	mapToLengths mapToStrictlyLessThan
package:	hof.map.client.exercise
source folder:	src/main/java

mapToLengths

public static ImmutableList<Integer> mapToLengths(ImmutableList<String> texts)

Use the String class's length() method.

mapToStrictlyLessThan

public static ImmutableList<Boolean> mapToStrictlyLessThan(ImmutableList<Integer> xs, int threshold)

FindHof

find

class:	Hof.java
methods:	find
package:	hof.util.exercise
source folder:	src/main/java

public static <E> Optional<E> find(Predicate<E> predicate, ImList<E> list) 

SML List map

FindHofClients

class:	FindHofClients.java
methods:	findFirstPalindrome
package:	hof.find.client.exercise
source folder:	src/main/java

findFirstPalindrome

public static Optional<String> findFirstPalindrome(ImmutableList<String> words)

Test

class:	HigherOrderFunctionTestSuite.java
package:	hof
source folder:	src/test/java

Map

class:	MapTestSuite.java
package:	hof.map
source folder:	src/test/java

Filter

class:	FilterTestSuite.java
package:	hof.filter
source folder:	src/test/java

Fold

class:	FoldTestSuite.java
package:	hof.fold
source folder:	src/test/java

Filter

class:	FindTestSuite.java
package:	hof.find
source folder:	src/test/java