<h1 id="heading-summary">Summary</h1>
Returns a list containing only elements matching the given [predicate](<a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/filter.html#kotlin.collections$filter(kotlin.Array((kotlin.collections.filter.T)),%20kotlin.Function1((kotlin.collections.filter.T,%20kotlin.Boolean)))/predicate" class="autolinkedURL autolinkedURL-url" target="_blank">kotlinlang.org/api/latest/jvm/stdlib/kotlin..</a>).
<pre><code class="lang-kotlin">public inline fun &lt;T&gt; Array&lt;out T&gt;.filter(predicate: (T) -&gt; Boolean): List&lt;T&gt; {
 return filterTo(ArrayList&lt;T&gt;(), predicate)
}
</code></pre>
<h1 id="heading-tip">Tip</h1>
<ol>
<li>Implemented internally using <code>filterTo()</code>.
</li>
<li><code>filterTo()</code> determines the return type based on the destination(ArrayList&lt;T&gt;).
</li>
</ol>
<h2 id="heading-filterto">filterTo()</h2>
<pre><code class="lang-kotlin">public inline fun &lt;T, C : MutableCollection&lt;in T&gt;&gt; Array&lt;out T&gt;.filterTo(destination: C, predicate: (T) -&gt; Boolean): C {
 for (element in this) if (predicate(element)) destination.add(element)
 return destination
}
</code></pre>
<h1 id="heading-in-practice">In Practice</h1>
<a target="_blank" href="https://school.programmers.co.kr/learn/courses/30/lessons/12928">Sum of divisors</a>
<pre><code class="lang-kotlin">class Solution {
 fun solution(n: Int): Int {
 return (1..n).filter{ n % it == 0}.sum()
 }
}
</code></pre>
<h1 id="heading-supported-data-types">Supported Data Types</h1>
<ul>
<li>Array
</li>
<li>ByteArray
</li>
<li>ShortArray
</li>
<li>IntArray
</li>
<li>LongArray
</li>
<li>FloatArray
</li>
<li>DoubleArray
</li>
<li>BooleanArray
</li>
<li>CharArray
</li>
<li>Iterable&lt;T&gt;
</li>
</ul>
<h1 id="heading-references">References</h1>
<a target="_blank" href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/filter.html">https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/filter.html</a>

# Summary

Returns a list containing only elements matching the given [predicate](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/filter.html#kotlin.collections$filter(kotlin.Array((kotlin.collections.filter.T)),%20kotlin.Function1((kotlin.collections.filter.T,%20kotlin.Boolean)))/predicate).

```kotlin
public inline fun <T> Array<out T>.filter(predicate: (T) -> Boolean): List<T> {
 return filterTo(ArrayList<T>(), predicate)
}
```

# Tip

1. Implemented internally using `filterTo()`.
 
2. `filterTo()` determines the return type based on the destination(ArrayList&lt;T&gt;).
 

## filterTo()

```kotlin
public inline fun <T, C : MutableCollection<in T>> Array<out T>.filterTo(destination: C, predicate: (T) -> Boolean): C {
 for (element in this) if (predicate(element)) destination.add(element)
 return destination
}
```

# In Practice

[Sum of divisors](https://school.programmers.co.kr/learn/courses/30/lessons/12928)

```kotlin
class Solution {
 fun solution(n: Int): Int {
 return (1..n).filter{ n % it == 0}.sum()
 }
}
```

# Supported Data Types

* Array
 
* ByteArray
 
* ShortArray
 
* IntArray
 
* LongArray
 
* FloatArray
 
* DoubleArray
 
* BooleanArray
 
* CharArray
 
* Iterable&lt;T&gt;
 

# References

[https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/filter.html](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/filter.html)

kotlin-stdlib / kotlin.collections / filter

[Doc Review]filter

Summary

[Doc Review]filter

kotlin-stdlib / kotlin.collections / filter

Table of contents

Summary

Tip

filterTo()

In Practice

Supported Data Types

References