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String() String . String .
new String(thing)
String(thing)
:
String() new . . .
thing.
String() (new ) . Symbol "Symbol(description)" , description description.
String() (new ) value String .
:
String .
String String .
const a = new String("Hello world"); // a === "Hello world" false
const b = String("Hello world"); // b === "Hello world" true
a instanceof String; // true
b instanceof String; // false
typeof a; // "object"
typeof b; // "string"
String() . .
const sym = Symbol("example");
`${sym}`; // TypeError: Cannot convert a Symbol value to a string
"" + sym; // TypeError: Cannot convert a Symbol value to a string
"".concat(sym); // TypeError: Cannot convert a Symbol value to a string
const sym = Symbol("example");
String(sym); // "Symbol(example)"
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-string-constructor |
This page was last modified on 2025 10 9 by MDN contributors.
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