The containing() method of Segments instances returns an object describing the segment in the string that includes the code unit at the specified index.
Syntax
containing(codeUnitIndex)
Parameters
codeUnitIndex- : A number specifying the index of the code unit in the original input string. If the value is omitted, it defaults to
0.
- : A number specifying the index of the code unit in the original input string. If the value is omitted, it defaults to
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
granularityis"word"; otherwise,undefined. Ifgranularityis"word", thenisWordLikeistruewhen the segment is word-like (i.e., consists of letters/numbers/ideographs/etc.); otherwise,false.
- : A boolean value only if
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