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authorMDN <actions@users.noreply.github.com>2021-06-15 00:35:40 +0000
committerMDN <actions@users.noreply.github.com>2021-06-15 00:35:40 +0000
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+---
+title: 'TypeError: invalid arguments'
+slug: orphaned/Web/JavaScript/Reference/Errors/Typed_array_invalid_arguments
+tags:
+ - Error
+ - Errors
+ - JavaScript
+ - TypeError
+translation_of: Web/JavaScript/Reference/Errors/Typed_array_invalid_arguments
+original_slug: Web/JavaScript/Reference/Errors/Typed_array_invalid_arguments
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="メッセージ">メッセージ</h2>
+
+<pre class="syntaxbox">TypeError: invalid arguments (Firefox)</pre>
+
+<h2 id="エラータイプ">エラータイプ</h2>
+
+<p>{{jsxref("TypeError")}}</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>新しい typed array を生成するために、<a href="/ja/docs/Web/JavaScript/Typed_arrays">Typed array</a> コンストラクターに以下のいずれかの値を渡す必要があります。</p>
+
+<ul>
+ <li>長さ</li>
+ <li>ほかの typed array</li>
+ <li>配列状オブジェクト</li>
+ <li>反復可能オブジェクト</li>
+ <li>{{jsxref("ArrayBuffer")}} オブジェクト</li>
+</ul>
+
+<p>そのほかのコンストラクター引数では、有効な typed array を生成できません。</p>
+
+<h2 id="例">例</h2>
+
+<p>Typed array、たとえば {{jsxref("Uint8Array")}} は文字列から構成できません。事実、文字列はまったく typed array にすることはできません。</p>
+
+<pre class="brush: js example-bad">var ta = new Uint8Array("nope");
+// TypeError: invalid arguments
+</pre>
+
+<p>有効な {{jsxref("Uint8Array")}} を生成するほかの方法:</p>
+
+<pre class="brush: js example-good">// From a length
+var uint8 = new Uint8Array(2);
+uint8[0] = 42;
+console.log(uint8[0]); // 42
+console.log(uint8.length); // 2
+console.log(uint8.BYTES_PER_ELEMENT); // 1
+
+// From an array
+var arr = new Uint8Array([21,31]);
+console.log(arr[1]); // 31
+
+// From another TypedArray
+var x = new Uint8Array([21, 31]);
+var y = new Uint8Array(x);
+console.log(y[0]); // 21
+
+// From an ArrayBuffer
+var buffer = new ArrayBuffer(8);
+var z = new Uint8Array(buffer, 1, 4);
+
+// From an iterable
+var iterable = function*(){ yield* [1,2,3]; }();
+var uint8 = new Uint8Array(iterable);
+// Uint8Array[1, 2, 3]
+</pre>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="/ja/docs/Web/JavaScript/Typed_arrays">Typed array</a></li>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+ <li>{{jsxref("Uint8Array")}}</li>
+</ul>