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The concat() method concatenates the string arguments to the calling string and returns a new string.

Sintassi

str.concat(string2[, string3, ..., stringN])

Parametri

string2...stringN

Stringhe da concatenare a questa stringa.

Valore di ritorno

 

Una nuova stringa contenente il testo combinato dalle stringhe fornite.

Descrizione

The concat() function concatenates the string arguments to the calling string and returns a new string. Changes to the original string or the returned string don't affect the other. If the arguments are not of the type string, they are converted to string values before concatenating.

Esempi

Using concat()

The following example combines strings into a new string.

var hello = 'Hello, ';
console.log(hello.concat('Kevin', '. Have a nice day.'));
/* Hello, Kevin. Have a nice day. */

var greetList = ['Hello', ' ', 'Venkat', '!'];
"".concat(...greetList); // "Hello Venkat!"

"".concat({}); // [object Object]
"".concat([]); // ""
"".concat(null); // "null"
"".concat(true); // "true"
"".concat(4, 5); // "45"

Prestazioni

It is strongly recommended that the assignment operators (+, +=) are used instead of the concat() method. 
According to this performance test, the assignment operators are several times faster.

Specifiche

Specification Status Comment
ECMAScript 3rd Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.2.
ECMAScript 5.1 (ECMA-262)
The definition of 'String.prototype.concat' in that specification.
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'String.prototype.concat' in that specification.
Standard  
ECMAScript Latest Draft (ECMA-262)
The definition of 'String.prototype.concat' in that specification.
Draft  

Compatibilità browser

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
Basic supportChrome Full support YesEdge Full support YesFirefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support

See also

Tag del documento e collaboratori

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