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author | Florian Dieminger <me@fiji-flo.de> | 2021-02-11 18:20:58 +0100 |
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committer | GitHub <noreply@github.com> | 2021-02-11 18:20:58 +0100 |
commit | 2318b37e3fd17a3e76a29b9be7d1ce82f040c3bb (patch) | |
tree | 5e640d40fd69dc380b04e01de981a345e0141ffa /files/es/web/javascript/reference/global_objects/math/log2 | |
parent | 6aa6274d2ad3e22e7f5e69b1d7531a5eaeaf5666 (diff) | |
parent | 8a5554c6fae83e92b10c8dbe5b82108cb44fad6c (diff) | |
download | translated-content-2318b37e3fd17a3e76a29b9be7d1ce82f040c3bb.tar.gz translated-content-2318b37e3fd17a3e76a29b9be7d1ce82f040c3bb.tar.bz2 translated-content-2318b37e3fd17a3e76a29b9be7d1ce82f040c3bb.zip |
Merge pull request #53 from fiji-flo/unslugging-es
Unslugging es
Diffstat (limited to 'files/es/web/javascript/reference/global_objects/math/log2')
-rw-r--r-- | files/es/web/javascript/reference/global_objects/math/log2/index.html | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/files/es/web/javascript/reference/global_objects/math/log2/index.html b/files/es/web/javascript/reference/global_objects/math/log2/index.html new file mode 100644 index 0000000000..8d8d45c60c --- /dev/null +++ b/files/es/web/javascript/reference/global_objects/math/log2/index.html @@ -0,0 +1,97 @@ +--- +title: Math.log2() +slug: Web/JavaScript/Reference/Global_Objects/Math/log2 +translation_of: Web/JavaScript/Reference/Global_Objects/Math/log2 +original_slug: Web/JavaScript/Referencia/Objetos_globales/Math/log2 +--- +<div>{{JSRef}}</div> + +<p>La función <strong><code>Math.log2()</code></strong> retorna el logaritmo base 2 de un número, esto es</p> + +<p><math display="block"><semantics><mrow><mo>∀</mo><mi>x</mi><mo>></mo><mn>0</mn><mo>,</mo><mstyle mathvariant="monospace"><mrow><mo lspace="0em" rspace="thinmathspace">Math.log2</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><msub><mo lspace="0em" rspace="0em">log</mo><mn>2</mn></msub><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mtext>the unique</mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mspace width="thickmathspace"></mspace><mtext>such that</mtext><mspace width="thickmathspace"></mspace><msup><mn>2</mn><mi>y</mi></msup><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\forall x > 0, \mathtt{\operatorname{Math.log2}(x)} = \log_2(x) = \text{the unique} \; y \; \text{such that} \; 2^y = x</annotation></semantics></math></p> + +<div>{{EmbedInteractiveExample("pages/js/math-log2.html")}}</div> + + + +<h2 id="Syntax">Syntax</h2> + +<pre class="syntaxbox"><code>Math.log2(<var>x</var>)</code></pre> + +<h3 id="Parámetros">Parámetros</h3> + +<dl> + <dt><code>x</code></dt> + <dd>Un número.</dd> +</dl> + +<h3 id="Valor_de_retorno">Valor de retorno</h3> + +<p>El logaritmo base 2 del número usado como parámetro. Si el número es negativo, {{jsxref("NaN")}} será retornado.</p> + +<h2 id="Descripción">Descripción</h2> + +<p>Si el valor de <code>x</code> es mejor a 0, el valor de retorno es siempre {{jsxref("NaN")}}.</p> + +<p>Debido a que <code>log2()</code> es una función estática de <code>Math</code>, siempre debe ser usado como <code>Math.log2()</code>, en lugar de ser usado como un método del objeto <code>Math</code> (<code>Math</code> no es un constructor).</p> + +<p>Esta función es equivalente a Math.log(x) / Math.log(2). Para log2(e) use la constante {{jsxref("Math.LOG2E")}} que es 1 / {{jsxref("Math.LN2")}}. </p> + +<h2 id="Ejemplos">Ejemplos</h2> + +<h3 id="Usando_Math.log2()">Usando <code>Math.log2()</code></h3> + +<pre class="brush: js">Math.log2(3); // 1.584962500721156 +Math.log2(2); // 1 +Math.log2(1); // 0 +Math.log2(0); // -Infinity +Math.log2(-2); // NaN +Math.log2(1024); // 10 +</pre> + +<h2 id="Polyfill">Polyfill</h2> + +<p>This Polyfill emulates the <code>Math.log2</code> function. Note that it returns imprecise values on some inputs (like 1 << 29), wrap into {{jsxref("Math.round()")}} if working with bit masks.</p> + +<pre class="brush: js">Math.log2 = Math.log2 || function(x) { + return Math.log(x) * Math.LOG2E; +}; +</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>{{SpecName('ES2015', '#sec-math.log2', 'Math.log2')}}</td> + <td>{{Spec2('ES2015')}}</td> + <td>Initial definition.</td> + </tr> + <tr> + <td>{{SpecName('ESDraft', '#sec-math.log2', 'Math.log2')}}</td> + <td>{{Spec2('ESDraft')}}</td> + <td> </td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p> + +<p>{{Compat("javascript.builtins.Math.log2")}}</p> + +<h2 id="See_also">See also</h2> + +<ul> + <li>{{jsxref("Math.exp()")}}</li> + <li>{{jsxref("Math.log()")}}</li> + <li>{{jsxref("Math.log10()")}}</li> + <li>{{jsxref("Math.log1p()")}}</li> + <li>{{jsxref("Math.pow()")}}</li> +</ul> |