From 1109132f09d75da9a28b649c7677bb6ce07c40c0 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:41:45 -0500
Subject: initial commit

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+---
+title: 'InternalError: too much recursion'
+slug: Web/JavaScript/Reference/Errors/Too_much_recursion
+translation_of: Web/JavaScript/Reference/Errors/Too_much_recursion
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="Message">Message</h2>
+
+<pre class="syntaxbox">Error: Out of stack space (Edge)
+InternalError: too much recursion (Firefox)
+RangeError: Maximum call stack size exceeded (Chrome)
+</pre>
+
+<h2 id="Error_type">Error type</h2>
+
+<p>{{jsxref("InternalError")}}.</p>
+
+<h2 id="What_went_wrong">What went wrong?</h2>
+
+<p>A function that calls itself is called a <em>recursive function</em>. Once a condition is met, the function stops calling itself. This is called a <em>base case</em>.</p>
+
+<p>In some ways, recursion is analogous to a loop. Both execute the same code multiple times, and both require a condition (to avoid an infinite loop, or rather, infinite recursion in this case). <span class="seoSummary">When there are too many function calls, or a function is missing a base case, JavaScript will throw this error.</span></p>
+
+<h2 id="Examples">Examples</h2>
+
+<p>This recursive function runs 10 times, as per the exit condition.</p>
+
+<pre class="brush: js">function loop(x) {
+  if (x &gt;= 10) // "x &gt;= 10" is the exit condition
+    return;
+  // do stuff
+  loop(x + 1); // the recursive call
+}
+loop(0);</pre>
+
+<p>Setting this condition to an extremely high value, won't work:</p>
+
+<pre class="brush: js example-bad">function loop(x) {
+  if (x &gt;= 1000000000000)
+    return;
+  // do stuff
+  loop(x + 1);
+}
+loop(0);
+
+// InternalError: too much recursion</pre>
+
+<p>This recursive function is missing a base case. As there is no exit condition, the function will call itself infinitely.</p>
+
+<pre class="brush: js example-bad">function loop(x) {
+ // The base case is missing
+
+loop(x + 1); // Recursive call
+}
+
+loop(0);
+
+// InternalError: too much recursion</pre>
+
+<h3 id="Class_error_too_much_recursion">Class error: too much recursion</h3>
+
+<pre class="brush: js example-bad">class Person{
+	constructor(){}
+	set name(name){
+		this.name = name; // Recursive call
+	}
+}
+
+
+const tony = new Person();
+tony.name = "Tonisha"; // InternalError: too much recursion
+</pre>
+
+<p>When a value is assigned to the property name (this.name = name;) JavaScript needs to set that property. When this happens, the setter function is triggered.</p>
+
+<pre class="brush: js example-bad">set name(name){
+	this.name = name; // Recursive call
+}
+</pre>
+
+<div class="note">
+<p>In this example when the setter is triggered, it is told to do the same thing again: <em>to set the same property that it is meant to handle.</em> This causes the function to call itself, again and again, making it infinitely recursive.</p>
+</div>
+
+<p>This issue also appears if the same variable is used in the getter.</p>
+
+<pre class="brush: js example-bad">get name(){
+	return this.name; // Recursive call
+}
+</pre>
+
+<p>To avoid this problem, make sure that the property being assigned to inside the setter function is different from the one that initially triggered the setter.The same goes for the getter.</p>
+
+<pre class="brush: js">class Person{
+	constructor(){}
+	set name(name){
+		this._name = name;
+	}
+	get name(){
+		return this._name;
+	}
+}
+const tony = new Person();
+tony.name = "Tonisha";
+console.log(tony);
+</pre>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{Glossary("Recursion")}}</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/Functions#Recursion">Recursive functions</a></li>
+</ul>
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