From de5c456ebded0e038adbf23db34cc290c8829180 Mon Sep 17 00:00:00 2001
From: Florian Merz <me@fiji-flo.de>
Date: Thu, 11 Feb 2021 14:49:24 +0100
Subject: unslug pl: move

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+---
+title: Array.prototype.flat()
+slug: Web/JavaScript/Referencje/Obiekty/Array/flat
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/flat
+---
+<div>{{JSRef}}</div>
+
+<div></div>
+
+<p>Metoda <code><strong>flat()</strong></code> tworzy nową tablicę ze wszystkich elementów, które są podtablicami, łącząc je rekursyjnie z podanym parametrem jak głęboko powinno nastąpić spłaszczenie.</p>
+
+<p class="hidden">\{{EmbedInteractiveExample("pages/js/array-flatten.html")}}</p>
+
+
+
+<h2 id="Składnia">Składnia</h2>
+
+<pre class="syntaxbox"><var>var newArray = arr</var>.flat(<em>[depth]</em>);</pre>
+
+<h3 id="Parametry">Parametry</h3>
+
+<dl>
+ <dt><code>depth</code> {{optional_inline}}</dt>
+ <dd>Parametr ten określa jak głęboko zagnieżdżona tablica powinna być spłaszczona. Wartość domyślna to 1.</dd>
+</dl>
+
+<h3 id="Zwracana_wartość">Zwracana wartość</h3>
+
+<p>Nowa tablica składająca się z połączonych elementów podtablic.</p>
+
+<h2 id="Przykłady">Przykłady</h2>
+
+<h3 id="Spłaszczanie_zagnieżdżonych_tablic">Spłaszczanie zagnieżdżonych tablic</h3>
+
+<pre class="brush: js">var arr1 = [1, 2, [3, 4]];
+arr1.flat();
+// [1, 2, 3, 4]
+
+var arr2 = [1, 2, [3, 4, [5, 6]]];
+arr2.flat();
+// [1, 2, 3, 4, [5, 6]]
+
+var arr3 = [1, 2, [3, 4, [5, 6]]];
+arr3.flat(2);
+// [1, 2, 3, 4, 5, 6]
+</pre>
+
+<h3 id="Spłaszczanie_i_puste_miejsca_tablicy">Spłaszczanie i puste miejsca tablicy</h3>
+
+<p>Metoda flat() usuwa puste miejsca w tablicy:</p>
+
+<pre class="brush: js">var arr4 = [1, 2, , 4, 5];
+arr4.flat();
+// [1, 2, 4, 5]
+</pre>
+
+<h2 id="Alternatywa">Alternatywa</h2>
+
+<h3 id="reduce_i_concat"><code>reduce</code> i <code>concat</code></h3>
+
+<pre class="brush: js">var arr1 = [1, 2, [3, 4]];
+arr1.flat();
+
+//to flat single level array
+arr1.reduce((acc, val) =&gt; acc.concat(val), []);// [1, 2, 3, 4]
+
+//or
+const flatSingle = arr =&gt; [].concat(...arr);
+</pre>
+
+
+
+<pre class="brush: js">//to enable deep level flatten use recursion with reduce and concat
+var arr1 = [1,2,3,[1,2,3,4, [2,3,4]]];
+
+function flattenDeep(arr1) {
+   return arr1.reduce((acc, val) =&gt; Array.isArray(val) ? acc.concat(flattenDeep(val)) : acc.concat(val), []);
+}
+flattenDeep(arr1);// [1, 2, 3, 1, 2, 3, 4, 2, 3, 4]
+</pre>
+
+
+
+<pre class="brush: js">//non recursive flatten deep using a stack
+var arr1 = [1,2,3,[1,2,3,4, [2,3,4]]];
+function flatten(input) {
+  const stack = [...input];
+  const res = [];
+  while (stack.length) {
+    // pop value from stack
+    const next = stack.pop();
+    if (Array.isArray(next)) {
+      // push back array items, won't modify the original input
+      stack.push(...next);
+    } else {
+      res.push(next);
+    }
+  }
+  //reverse to restore input order
+  return res.reverse();
+}
+flatten(arr1);// [1, 2, 3, 1, 2, 3, 4, 2, 3, 4]
+</pre>
+
+
+
+<pre class="brush: js">//recursive flatten deep
+function flatten(array) {
+  var flattend = [];
+  !(function flat(array) {
+    array.forEach(function(el) {
+      if (Array.isArray(el)) flat(el);
+      else flattend.push(el);
+    });
+  })(array);
+  return flattend;
+}
+</pre>
+
+
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<pre class="brush: js">if (!Array.prototype.flat) {
+  Array.prototype.flat = function(depth) {
+    var flattend = [];
+    (function flat(array, depth) {
+      for (let el of array) {
+        if (Array.isArray(el) &amp;&amp; depth &gt; 0) {
+          flat(el, depth - 1);
+        } else {
+          flattend.push(el);
+        }
+      }
+    })(this, Math.floor(depth) || 1);
+    return flattend;
+  };
+}
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td><a href="https://tc39.github.io/proposal-flatMap/#sec-Array.prototype.flat"><code>Array.prototype.flat</code> proposal</a></td>
+   <td>Finished (4)</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+
+
+<p>{{Compat("javascript.builtins.Array.flat")}}</p>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.flatMap()")}}</li>
+ <li>{{jsxref("Array.prototype.map()")}}</li>
+ <li>{{jsxref("Array.prototype.reduce()")}}</li>
+ <li>{{jsxref("Array.prototype.concat()")}}</li>
+</ul>
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