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Segments.prototype.containing()

The containing() method of Segments instances returns an object describing the segment in the string that includes the code unit at the specified index.

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Syntax

containing(codeUnitIndex)

Parameters

codeUnitIndex Optional: A number specifying the index of the code unit in the original input string. If the value is omitted, it defaults to 0.

Return value

An object describing the segment of the original string with the following properties, or undefined if the supplied index value is out of bounds.

segment: A string containing the segment extracted from the original input string.
index: The code unit index in the original input string at which the segment begins.
input: The complete input string that was segmented.
isWordLike: A boolean value only if granularity is "word"; otherwise, undefined. If granularity is "word", then isWordLike is true when the segment is word-like (i.e., consists of letters/numbers/ideographs/etc.); otherwise, false.

Examples

// ┃0 1 2 3 4 5┃6┃7┃8┃9  ← code unit index
// ┃A l l o n s┃-┃y┃!┃   ← code unit
const input = "Allons-y!";

const segmenter = new Intl.Segmenter("fr", { granularity: "word" });
const segments = segmenter.segment(input);

let current = segments.containing();
// { index: 0, segment: "Allons", isWordLike: true }

current = segments.containing(4);
// { index: 0, segment: "Allons", isWordLike: true }

current = segments.containing(6);
// { index: 6, segment: "-", isWordLike: false }

current = segments.containing(current.index + current.segment.length);
// { index: 7, segment: "y", isWordLike: true }

current = segments.containing(current.index + current.segment.length);
// { index: 8, segment: "!", isWordLike: false }

current = segments.containing(current.index + current.segment.length);
// undefined

Specifications

Specification
ECMAScript Internationalization API Specification # sec-%segmentsprototype%.containing

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`containing`	87	87	No	73	14.1	87	No	62	14.5	14.0	87	1.8	16.0.0