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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: 'RangeError: argument is not a valid code point'
+slug: Web/JavaScript/Reference/Errors/Not_a_codepoint
+tags:
+ - Errors
+ - JavaScript
+ - RangeError
+translation_of: Web/JavaScript/Reference/Errors/Not_a_codepoint
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="メッセージ">メッセージ</h2>
+
+<pre class="syntaxbox">RangeError: {0} is not a valid code point (Firefox)
+RangeError: Invalid code point {0} (Chrome)
+</pre>
+
+<h2 id="エラータイプ">エラータイプ</h2>
+
+<p>{{jsxref("RangeError")}}</p>
+
+<h2 id="何がうまくいかなかったのか?">何がうまくいかなかったのか?</h2>
+
+<p>{{jsxref("String.fromCodePoint()")}} メソッドは、有効なコードポイントのみを受け付けます。</p>
+
+<p><a href="https://ja.wikipedia.org/wiki/%E7%AC%A6%E5%8F%B7%E7%82%B9">コードポイント</a>は、ユニコード文字集合の値です。これは整数 <code>0</code> から <code>0x10FFFF</code> までの範囲です。</p>
+
+<p>{{jsxref("NaN")}} や、-1 などの負数(negative Integers)、3.14 などの非整数値(non-integers)、<code>0x10FFFF</code>(<code>1114111</code>)より大きい値をこのメソッドで使うことはできません。</p>
+
+<h2 id="例">例</h2>
+
+<h3 id="無効なケース">無効なケース</h3>
+
+<pre class="brush: js example-bad">String.fromCodePoint('_'); // RangeError
+String.fromCodePoint(Infinity); // RangeError
+String.fromCodePoint(-1); // RangeError
+String.fromCodePoint(3.14); // RangeError
+String.fromCodePoint(3e-2); // RangeError
+String.fromCodePoint(NaN); // RangeError</pre>
+
+<h3 id="有効なケース">有効なケース</h3>
+
+<pre class="brush: js example-good">String.fromCodePoint(42); // "*"
+String.fromCodePoint(65, 90); // "AZ"
+String.fromCodePoint(0x404); // "\u0404"
+String.fromCodePoint(0x2F804); // "\uD87E\uDC04"
+String.fromCodePoint(194564); // "\uD87E\uDC04"
+String.fromCodePoint(0x1D306, 0x61, 0x1D307) // "\uD834\uDF06a\uD834\uDF07"
+</pre>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li>{{jsxref("String.fromCodePoint()")}}</li>
+</ul>