@stdlib/assert-has-utf16-surrogate-pair-at NPM

hasUTF16SurrogatePairAt

Test if a position in a string marks the start of a UTF-16 surrogate pair.

Installation

npm install @stdlib/assert-has-utf16-surrogate-pair-at

Usage

var hasUTF16SurrogatePairAt = require( '@stdlib/assert-has-utf16-surrogate-pair-at' );

hasUTF16SurrogatePairAt( string, position )

Tests if a position (in UTF-16 code units) in a string marks the start of a UTF-16 surrogate pair.

var bool = hasUTF16SurrogatePairAt( '🌷', 0 );
// returns true

bool = hasUTF16SurrogatePairAt( '🌷', 1 );
// returns false

Notes

Note that position does not refer to a visual character position, but to an index in the ordered sequence of UTF-16 code units.

Examples

var hasUTF16SurrogatePairAt = require( '@stdlib/assert-has-utf16-surrogate-pair-at' );

var bool = hasUTF16SurrogatePairAt( '🌷', 0 );
// returns true

bool = hasUTF16SurrogatePairAt( '🌷', 1 );
// returns false

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.