time-to-botec/squiggle/node_modules/@stdlib/assert/has-utf16-surrogate-pair-at/README.md
NunoSempere b6addc7f05 feat: add the node modules
Necessary in order to clearly see the squiggle hotwiring.
2022-12-03 12:44:49 +00:00

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# hasUTF16SurrogatePairAt
> Test if a position in a string marks the start of a [UTF-16][utf-16] surrogate pair.
<section class="usage">
## Usage
```javascript
var hasUTF16SurrogatePairAt = require( '@stdlib/assert/has-utf16-surrogate-pair-at' );
```
#### hasUTF16SurrogatePairAt( string, position )
Tests if a `position` (in [UTF-16][utf-16] code units) in a `string` marks the start of a [UTF-16][utf-16] surrogate pair.
```javascript
var bool = hasUTF16SurrogatePairAt( '🌷', 0 );
// returns true
bool = hasUTF16SurrogatePairAt( '🌷', 1 );
// returns false
```
</section>
<!-- /.usage -->
<section class="notes">
## Notes
- Note that `position` does **not** refer to a visual character position, but to an index in the ordered sequence of [UTF-16][utf-16] code units.
</section>
<!-- /.notes -->
<section class="examples">
## Examples
<!-- eslint no-undef: "error" -->
```javascript
var hasUTF16SurrogatePairAt = require( '@stdlib/assert/has-utf16-surrogate-pair-at' );
var bool = hasUTF16SurrogatePairAt( '🌷', 0 );
// returns true
bool = hasUTF16SurrogatePairAt( '🌷', 1 );
// returns false
```
</section>
<!-- /.examples -->
* * *
<section class="cli">
## CLI
<section class="usage">
### Usage
```text
Usage: has-utf16-surrogate-pair-at [options] [<string>] --pos=<index>
Options:
-h, --help Print this message.
-V, --version Print the package version.
--pos index Position in string.
```
</section>
<!-- /.usage -->
<section class="examples">
### Examples
```bash
$ has-utf16-surrogate-pair-at --pos=0 🌷
true
```
To use as a [standard stream][standard-streams],
```bash
$ echo -n '🌷' | has-utf16-surrogate-pair-at --pos=1
false
```
</section>
<!-- /.examples -->
</section>
<!-- /.cli -->
<section class="links">
[utf-16]: https://en.wikipedia.org/wiki/UTF-16
[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams
</section>
<!-- /.links -->