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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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Functions: FnList</title>
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<div class="section"><h2>Functions: FnList<a name="Functions:_FnList"></a></h2>
<div class="section"><h3>1. Overview<a name="a1._Overview"></a></h3>
<p>
<a class="externalLink" href="https://www.op4j.org/apidocs/org/op4j/functions/FnList.html"><b>FnList</b></a> is a
<i>parameterizable function hub class</i> and, before giving you access to the real functions, you will
have to specify the type parameter, which will give you access to the functions containing the operations
on <i>Lists</i>:
</p>
<ul>
<li>
<tt>FnList.ofBigDecimal()</tt>: returns <a href="#FnListOf">FnListOf<BigDecimal></a>
</li>
<li>
<tt>FnList.ofBigInteger()</tt>: returns <a href="#FnListOf">FnListOf<BigInteger></a>
</li>
<li>
<tt>FnList.ofBoolean()</tt>: returns <a href="#FnListOf">FnListOf<Boolean></a>
</li>
<li>
<tt>FnList.ofByte()</tt>: returns <a href="#FnListOf">FnListOf<Byte></a>
</li>
<li>
<tt>FnList.ofCalendar()</tt>: returns <a href="#FnListOf">FnListOf<Calendar></a>
</li>
<li>
<tt>FnList.ofCharacter()</tt>: returns <a href="#FnListOf">FnListOf<Character></a>
</li>
<li>
<tt>FnList.ofDate()</tt>: returns <a href="#FnListOf">FnListOf<Date></a>
</li>
<li>
<tt>FnList.ofDouble()</tt>: returns <a href="#FnListOf">FnListOf<Double></a>
</li>
<li>
<tt>FnList.ofFloat()</tt>: returns <a href="#FnListOf">FnListOf<Float></a>
</li>
<li>
<tt>FnList.ofInteger()</tt>: returns <a href="#FnListOf">FnListOf<Integer></a>
</li>
<li>
<tt>FnList.ofLong()</tt>: returns <a href="#FnListOf">FnListOf<Long></a>
</li>
<li>
<tt>FnList.ofObject()</tt>: returns <a href="#FnListOf">FnListOf<Object></a>
</li>
<li>
<tt>FnList.ofShort()</tt>: returns <a href="#FnListOf">FnListOf<Short></a>
</li>
<li>
<tt>FnList.ofString()</tt>: returns <a href="#FnListOf">FnListOf<String></a>
</li>
<li>
<tt>FnList.of(final Type<T> type)</tt>: returns <a href="#FnListOf">FnListOf<T></a>
parameterized with the given type. This is the most generic function in <i>FnList</i>
</li>
<li>
<tt>FnList.ofArrayOf(final Type<T> type)</tt>: returns <a href="#FnListOfArrayOf">FnListOfArrayOf<T></a>
parameterized with the given type.
</li>
<li>
<tt>FnList.ofListOf(final Type<T> type)</tt>: returns <a href="#FnListOfListOf">FnListOfListOf<T></a>
parameterized with the given type.
</li>
<li>
<tt>FnList.ofSetOf(final Type<T> type)</tt>: returns <a href="#FnListOfSetOf">FnListOfSetOf<T></a>
parameterized with the given type.
</li>
</ul>
</div>
<div class="section"><h3>FnListOf<a name="FnListOf"></a></h3>
<p>
The functions in <b>FnListOf</b> are applied on <i>Lists</i>. <i>FnListOf is a parameterizable class</i> so,
in order to use it, you must specify the type parameter (i.e. FnList.ofBigDecimal(), FnList.ofLong(),
FnList.of(final Type<T> type), ...).
</p>
<p>
<tt>FnList.of(final Type<T> type)</tt>
is the most generic method that gives you access to <i>FnListOf</i> though there are some shortcuts for common classes:
<tt>FnList.ofBigDecimal(), FnList.ofInteger(), FnList.ofDate(), FnList.ofCharacter(), ...</tt>
</p>
<p>
The examples below show how these functions can be used:
</p>
<div class="source">
<div><pre>
/* This piece of code converts the Strings into Calendar and sorts them */
Op.onListFor("2000/11/10", "2010/10/10", "2000/01/10")
.forEach().exec(FnString.toCalendar("yyyy/MM/dd")).endFor()
.exec(FnList.ofCalendar().sort()).get();
/* This piece of code creates the map {first = [23], second = [2.3], third = [-23.456]} */
Op.onListFor(BigDecimal.valueOf(23), BigDecimal.valueOf(2.3), BigDecimal.valueOf(-23.456))
.exec(FnList.ofBigDecimal().zipAndGroupKeys("first", "second", "third")).get();
/* This piece of code creates the map {ff0000 = red, 00ff00 = green, 0000ff = blue} */
Op.onListFor("ff0000", "red", "00ff00", "green", "0000ff", "blue")
.exec(FnList.ofString().couple()).get();</pre></div>
</div>
<div>
<!-- Table with functions -->
<table class="bodyTable" border="0">
<thead><tr class="a"><th>Function name</th><th>Type</th><th width="240px">Params</th><th>Description</th></tr></thead>
<tbody>
<tr class="b"><td><b>add</b></td><td>Function<List<T>,List<T>></td><td>T... newElements</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>addAll</b></td><td>Function<List<T>,List<T>></td><td>Collection<T> collection</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>all</b></td><td>Function<List<T>,Boolean></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>any</b></td><td>Function<List<T>,Boolean></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>contains</b></td><td>Function<List<T>,Boolean></td><td>T object</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>containsAll</b></td><td>Function<List<T>,Boolean></td><td>T... objects</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>containsAny</b></td><td>Function<List<T>,Boolean></td><td>T... objects</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>containsNone</b></td><td>Function<List<T>,Boolean></td><td>T... objects</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>count</b></td><td>Function<List<T>,Integer></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>couple</b></td><td>Function<List<T>,Map<T,T>></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>coupleAndGroup</b></td><td>Function<List<T>,Map<T,List<T>>></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>distinct</b></td><td>Function<List<T>,List<T>></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>insert</b></td><td>Function<List<T>,List<T>></td><td>int position<br />T... newElements</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>notContains</b></td><td>Function<List<T>,Boolean></td><td>T object</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>removeAllEqual</b></td><td>Function<List<T>,List<T>></td><td>T... values</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>removeAllFalse</b></td><td>Function<List<T>,List<T>></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>removeAllIndexes</b></td><td>Function<List<T>,List<T>></td><td>int... indexes</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>removeAllIndexesNot</b></td><td>Function<List<T>,List<T>></td><td>int... indexes</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>removeAllNotNullAndFalse</b></td><td>Function<List<T>,List<T>></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>removeAllNotNullAndTrue</b></td><td>Function<List<T>,List<T>></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>removeAllNull</b></td><td>Function<List<T>,List<T>></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>removeAllNullOrFalse</b></td><td>Function<List<T>,List<T>></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>removeAllNullOrTrue</b></td><td>Function<List<T>,List<T>></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>removeAllTrue</b></td><td>Function<List<T>,List<T>></td><td>IFunction<? super T,Boolean> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>reverse</b></td><td>Function<List<T>,List<T>></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>sort</b></td><td>Function<List<T>,List<T>></td><td></td><td></td></tr>
<tr class="b"><td><b>sort</b></td><td>Function<List<T>,List<T>></td><td>Comparator<? super T> comparator</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>sortBy</b></td><td>Function<List<T>,List<T>></td><td>IFunction<? super T, ?> by</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>toArray</b></td><td>Function<List<T>,T[]></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>toGroupMap</b></td><td>Function<List<T>,Map<K,List<V>>></td><td>IFunction<? super T,Map.Entry<K,V>> mapBuilder</td><td></td></tr>
<tr class="b"><td><b>toGroupMap</b></td><td>Function<List<T>,Map<K,List<V>>></td><td>IFunction<? super T,K> keyFunction<br />IFunction<? super T,V> valueFunction</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>toMap</b></td><td>Function<List<T>,Map<K,V>></td><td>IFunction<? super T,Map.Entry<K,V>> mapBuilder</td><td></td></tr>
<tr class="b"><td><b>toMap</b></td><td>Function<List<T>,Map<K,V>></td><td>IFunction<? super T,K> keyFunction<br />IFunction<? super T,V> valueFunction</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>toSet</b></td><td>Function<List<T>,Set<T>></td><td></td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipAndGroupKeys</b></td><td>Function<List<T>,Map<K,List<T>>></td><td>K... keys</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>zipAndGroupKeysBy</b></td><td>Function<List<T>,Map<K,List<T>>></td><td>IFunction<? super T, K> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipAndGroupKeysFrom</b></td><td>Function<List<T>,Map<K,List<T>>></td><td>Collection<K> keys</td><td></td></tr>
<tr class="a"><td><b>zipAndGroupKeysFrom</b></td><td>Function<List<T>,Map<K,List<T>>></td><td>K[] keys</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipAndGroupValues</b></td><td>Function<List<T>,Map<T,List<V>>></td><td>V... values</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>zipAndGroupValuesBy</b></td><td>Function<List<T>,Map<T,List<V>>></td><td>IFunction<? super T, V> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipAndGroupValuesFrom</b></td><td>Function<List<T>,Map<T,List<V>>></td><td>Collection<V> values</td><td></td></tr>
<tr class="a"><td><b>zipAndGroupValuesFrom</b></td><td>Function<List<T>,Map<T,List<V>>></td><td>V[] values</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipKeys</b></td><td>Function<List<T>,Map<K,T>></td><td>K... keys</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>zipKeysBy</b></td><td>Function<List<T>,Map<K,T>></td><td>IFunction<? super T, K> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipKeysFrom</b></td><td>Function<List<T>,Map<K,T>></td><td>Collection<K> keys</td><td></td></tr>
<tr class="a"><td><b>zipKeysFrom</b></td><td>Function<List<T>,Map<K,T>></td><td>K[] keys</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipValues</b></td><td>Function<List<T>,Map<T,V>></td><td>V... values</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>zipValuesBy</b></td><td>Function<List<T>,Map<T,V>></td><td>IFunction<? super T, V> eval</td><td></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>zipValuesFrom</b></td><td>Function<List<T>,Map<T,V>></td><td>Collection<V> values</td><td></td></tr>
<tr class="a"><td><b>zipValuesFrom</b></td><td>Function<List<T>,Map<T,V>></td><td>V[] values</td><td></td></tr>
</tbody></table>
<!-- -->
</div>
</div>
<div class="section"><h3>FnListOfArrayOf<a name="FnListOfArrayOf"></a></h3>
<p>
The functions in <b>FnListOfArrayOf</b> are applied on <i>Lists of Arrays</i> of any type. <i>FnListOfArrayOf is a
parameterizable class</i> so, in order to use it, you must specify the type parameter
(i.e. FnList.ofArrayOf(Types.INTEGER), FnList.ofArrayOf(Types.LONG)). The example below shows how it can be used:
</p>
<div class="source">
<div><pre>
/* The code below flattens the target List of Array so, the result of the operation will be the list ["first", "second", "third"] */
Op.on(new String[][] {Op.onArrayFor("first", "second").get(), Op.onArrayFor("third").get()})
.toList().exec(FnList.ofArrayOf(Types.STRING).flattenArrays()).get();</pre></div>
</div>
<div>
<!-- Table with functions -->
<table class="bodyTable" border="0">
<thead><tr class="a"><th>Function name</th><th>Type</th><th width="240px">Params</th><th>Description</th></tr></thead>
<tbody>
<tr class="b"><td><b>flattenArrays</b></td><td>Function<List<T[]>,List<T>></td><td></td><td></td></tr>
</tbody></table>
<!-- -->
</div>
</div>
<div class="section"><h3>FnListOfListOf<a name="FnListOfListOf"></a></h3>
<p>
The functions in <b>FnListOfListOf</b> are applied on <i>Lists of Lists</i> of any type. <i>FnListOfListOf is a
parameterizable class</i> so, in order to use it, you must specify the type parameter
(i.e. FnList.ofListOf(Types.INTEGER), FnList.ofListOf(Types.LONG)). The example below shows how it can be used:
</p>
<div class="source">
<div><pre>
/* Suppose we have a List<List<String>>, the piece of code below would return the flattened lists as a single list: ["first", "second", "third"] */
Op.onListFor(Op.onListFor("first", "second").get(), Op.onListFor("third").get())
.exec(FnList.ofListOf(Types.STRING).flattenLists()).get();</pre></div>
</div>
<div>
<!-- Table with functions -->
<table class="bodyTable" border="0">
<thead><tr class="a"><th>Function name</th><th>Type</th><th width="240px">Params</th><th>Description</th></tr></thead>
<tbody>
<tr class="b"><td><b>flattenLists</b></td><td>Function<List<List<T>>,List<T>></td><td></td><td></td></tr>
</tbody></table>
<!-- -->
</div>
</div>
<div class="section"><h3>FnListOfSetOf<a name="FnListOfSetOf"></a></h3>
<p>
The functions in <b>FnListOfSetOf</b> are applied on <i>Lists of Sets</i> of any type. <i>FnListOfSetOf is a
parameterizable class</i> so, in order to use it, you must specify the type parameter
(i.e. FnList.ofSetOf(Types.INTEGER), FnList.ofSetOf(Types.LONG)). The example below shows how it can be used:
</p>
<div class="source">
<div><pre>
/* Suppose we have a List<Set<String>>, the piece of code below would return the flattened sets as a single list: ["first", "second", "third"] */
Op.onListFor(Op.onSetFor("first", "second").get(), Op.onSetFor("third").get())
.exec(FnList.ofSetOf(Types.STRING).flattenSets()).get()</pre></div>
</div>
<div>
<!-- Table with functions -->
<table class="bodyTable" border="0">
<thead><tr class="a"><th>Function name</th><th>Type</th><th width="240px">Params</th><th>Description</th></tr></thead>
<tbody>
<tr class="b"><td><b>flattenSets</b></td><td>Function<List<Set<T>>,List<T>></td><td></td><td></td></tr>
</tbody></table>
<!-- -->
</div>
</div>
</div>
</div>
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