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Segments.prototype[Symbol.iterator]()

Baseline 2024

Newly available

Since ⁨April 2024⁩, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

The [Symbol.iterator]() method of Segments instances implements the iterable protocol and allows Segments objects to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns a segments iterator object that yields data about each segment.

Try it

const segmenterFr = new Intl.Segmenter("fr", { granularity: "word" });
const string = "Que ma joie demeure";

const iterator = segmenterFr.segment(string)[Symbol.iterator]();

for (const segment of iterator) {
  if (segment.segment.length > 4) {
    console.log(segment.segment);
  }
}

// Expected output: "demeure"

Syntax

segments[Symbol.iterator]()

Parameters

None.

Return value

A new iterable iterator object that yields data about each segment. Each yielded object has the same properties as the object returned by the containing() method.

Examples

Iteration using for...of loop

Note that you seldom need to call this method directly. The existence of the [Symbol.iterator]() method makes Segments objects iterable, and iterating syntaxes like the for...of loop automatically call this method to obtain the iterator to loop over.

const segmenter = new Intl.Segmenter("zh-CN", { granularity: "word" });
const input = "你好，世界！我爱编程。";

for (const value of segmenter.segment(input)) {
  console.log(value);
}

/*
{segment: '你好', index: 0, input: '你好，世界！我爱编程。', isWordLike: true}
{segment: '，', index: 2, input: '你好，世界！我爱编程。', isWordLike: false}
{segment: '世界', index: 3, input: '你好，世界！我爱编程。', isWordLike: true}
{segment: '！', index: 5, input: '你好，世界！我爱编程。', isWordLike: false}
{segment: '我', index: 6, input: '你好，世界！我爱编程。', isWordLike: true}
{segment: '爱', index: 7, input: '你好，世界！我爱编程。', isWordLike: true}
{segment: '编', index: 8, input: '你好，世界！我爱编程。', isWordLike: true}
{segment: '程', index: 9, input: '你好，世界！我爱编程。', isWordLike: true}
{segment: '。', index: 10, input: '你好，世界！我爱编程。', isWordLike: false}
*/

Manually hand-rolling the iterator

You may still manually call the next() method of the returned iterator object to achieve maximum control over the iteration process.

const segmenter = new Intl.Segmenter("fr", { granularity: "word" });
const input = "Moi ? N'est-ce pas ?";
const segments = segmenter.segment(input);
const iterator = segments[Symbol.iterator]();

let result = iterator.next();

while (!result.done) {
  console.log(result.value);
  result = iterator.next();
}

/*
{segment: 'Moi', index: 0, input: "Moi ? N'est-ce pas ?", isWordLike: true}
{segment: ' ', index: 3, input: "Moi ? N'est-ce pas ?", isWordLike: false}
{segment: '?', index: 4, input: "Moi ? N'est-ce pas ?", isWordLike: false}
{segment: ' ', index: 5, input: "Moi ? N'est-ce pas ?", isWordLike: false}
{segment: "N'est", index: 6, input: "Moi ? N'est-ce pas ?", isWordLike: true}
{segment: '-', index: 11, input: "Moi ? N'est-ce pas ?", isWordLike: false}
{segment: 'ce', index: 12, input: "Moi ? N'est-ce pas ?", isWordLike: true}
{segment: ' ', index: 14, input: "Moi ? N'est-ce pas ?", isWordLike: false}
{segment: 'pas', index: 15, input: "Moi ? N'est-ce pas ?", isWordLike: true}
{segment: ' ', index: 18, input: "Moi ? N'est-ce pas ?", isWordLike: false}
{segment: '?', index: 19, input: "Moi ? N'est-ce pas ?", isWordLike: false}
*/

Specifications

Specification
ECMAScript® 2026 Internationalization API Specification> # sec-%intlsegmentsprototype%-%symbol.iterator%>

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`Symbol.iterator`	87	87	125	73	14.1	87	125	62	14.5	14.0	87	14.5	1.0.0	1.8	16.0.0