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author | MDN <actions@users.noreply.github.com> | 2021-06-15 00:35:40 +0000 |
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committer | MDN <actions@users.noreply.github.com> | 2021-06-15 00:35:40 +0000 |
commit | 522984283b56b68582d606c76e4ca98c0baf9451 (patch) | |
tree | 0bf1a6328efd2bf74b118ff823b5208de78dec0b /files/ja/orphaned/web/javascript | |
parent | ee3bbc7c983772815b6168c0c146fabbf1536105 (diff) | |
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-rw-r--r-- | files/ja/orphaned/web/javascript/reference/errors/typed_array_invalid_arguments/index.html | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/files/ja/orphaned/web/javascript/reference/errors/typed_array_invalid_arguments/index.html b/files/ja/orphaned/web/javascript/reference/errors/typed_array_invalid_arguments/index.html new file mode 100644 index 0000000000..b02af7aa13 --- /dev/null +++ b/files/ja/orphaned/web/javascript/reference/errors/typed_array_invalid_arguments/index.html @@ -0,0 +1,78 @@ +--- +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> |