Symbol.prototype.toString() - JavaScript 编辑

The toString() method returns a string representing the specified Symbol object.

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The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

Symbol().toString()

Return value

A string representing the specified Symbol object.

Description

The Symbol object overrides the toString method of the Object object; it does not inherit Object.prototype.toString(). For Symbol objects, the toString method returns a string representation of the object.

No string concatenation

While you can call toString() on Symbols, you cannot use string concatenation with them:

Symbol('foo') + 'bar'        // TypeError: Can't convert symbol to string

Examples

Using toString()

Symbol('desc').toString()    // "Symbol(desc)"

// well-known symbols
Symbol.iterator.toString()   // "Symbol(Symbol.iterator)

// global symbols
Symbol.for('foo').toString() // "Symbol(foo)"

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Symbol.prototype.toString' in that specification.

Browser compatibility

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See also

• Object.prototype.toString()