Set.prototype.size - JavaScript 编辑

The size accessor property returns the number of (unique) elements in a Set 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.

Description

The value of size is an integer representing how many entries the Set object has. A set accessor function for size is undefined; you cannot change this property.

Examples

Using size

var mySet = new Set();
mySet.add(1);
mySet.add(5);
mySet.add('some text')

mySet.size; // 3

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also

• Set