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This feature is well established and works across many devices and browser versions. Its been available across browsers since julio de 2015.
La propiedad length de un objeto String representa la longitud de una cadena, en unidades de cdigo UTF-16.
str.length
Esta propiedad devuelve el nmero de caracteres de una cadena. UTF-16, el formato usado por JavaScript, usa 16-bit para representar los caracteres ms comunes, pero necesita usar dos caracteres para otros menos usados, as que es posible que el valor devuelto por length no corresponda al nmero de caracteres de la cadena.
ECMASCript 2016 (ed. 7) estableci una longitud mxima de 2^53 - 1 elementos. Anteriormente, ninguna longitud mxima era especificada.
Para una cadena vaca, length es 0.
La propiedad static String.length devuelve 1.
var x = "Mozilla";
var empty = "";
console.log("Mozilla is " + x.length + " code units long");
/* "Mozilla is 7 code units long" */
console.log("The empty string has a length of " + empty.length);
/* "The empty string has a length of 0" */
var myString = "bluebells";
// Attempting to assign a value to a string's .length property has no observable effect.
myString.length = 4;
console.log(myString);
/* "bluebells" */
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-properties-of-string-instances-length |
This page was last modified on 5 ago 2023 by MDN contributors.
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