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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase below:

String.prototype.toUpperCase() - JavaScript | MDN

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This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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El toUpperCase() método devuelve el valor convertido en mayúsculas de la cadena que realiza la llamada.

cadena.toUpperCase()

El método toUpperCase devuelve el valor de la cadena convertida a mayúsculas. toUpperCase no afecta al valor de la cadena en sí mismo.

El siguiente ejemplo muestra la cadena "ALPHABET":

js

console.log("alphabet".toUpperCase()); // "ALPHABET"

• String.prototype.toLocaleUpperCase()
• String.prototype.toLowerCase()

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