time-to-botec

README.md (6683B)

---

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 # fromCodePoint
 
 > Create a string from a sequence of Unicode [code points][code-point].
 
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 ## Usage
 
 ```javascript
 var fromCodePoint = require( '@stdlib/string/from-code-point' );
 ```
 
 #### fromCodePoint( pt1\[, pt2\[, pt3\[, ...]]] )
 
 Creates a `string` from a sequence of Unicode [code points][code-point].
 
 ```javascript
 var out = fromCodePoint( 9731 );
 // returns '☃'
 ```
 
 In addition to providing [code points][code-point] as separate arguments, the function supports providing an array-like `object` as a single argument containing a sequence of [code points][code-point].
 
 ```javascript
 var Uint16Array = require( '@stdlib/array/uint16' );
 
 var out = fromCodePoint( 97, 98, 99 );
 // returns 'abc'
 
 out = fromCodePoint( new Uint16Array( [ 97, 98, 99 ] ) );
 // returns 'abc'
 ```
 
 </section>
 
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 ## Notes
 
 -   This function differs from [`String.fromCharCode`][mdn-string-fromcharcode] in the following ways:
 
     -   The function provides support for all valid Unicode values (up to `21` bits). While most common Unicode values can be represented using one 16-bit unit, higher code point characters require two 16-bit units (a surrogate pair consisting of a high and a low surrogate) to form a single character. [`String.fromCharCode`][mdn-string-fromcharcode] does **not** support surrogate pairs, supporting only UCS-2, a subset of [UTF-16][utf-16].
 
 -   This function differs from [`String.fromCodePoint`][mdn-string-fromcodepoint] in the following ways:
 
     -   The function supports explicitly providing an array-like `object` containing a sequence of [code points][code-point].
     -   The function requires **at least** one [code point][code-point].
     -   The function requires that all [code points][code-point] be nonnegative integers. The function does **not** support values, such as `null`, `undefined`, `true`, `false`, `'0'`, `'1'`, etc., which can be cast to integer values.
 
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 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var randu = require( '@stdlib/random/base/randu' );
 var floor = require( '@stdlib/math/base/special/floor' );
 var UNICODE_MAX_BMP = require( '@stdlib/constants/unicode/max-bmp' );
 var fromCodePoint = require( '@stdlib/string/from-code-point' );
 
 var x;
 var i;
 
 for ( i = 0; i < 100; i++ ) {
     x = floor( randu()*UNICODE_MAX_BMP );
     console.log( '%d => %s', x, fromCodePoint( x ) );
 }
 ```
 
 </section>
 
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 * * *
 
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 ## CLI
 
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 ### Usage
 
 ```text
 Usage: from-code-point [options] [<code_point> <code_point> ...]
 
 Options:
 
   -h,    --help                Print this message.
   -V,    --version             Print the package version.
          --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.
 ```
 
 </section>
 
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 ### Notes
 
 -   If the split separator is a [regular expression][mdn-regexp], ensure that the `split` option is either properly escaped or enclosed in quotes.
 
     ```bash
     # Not escaped...
     $ echo -n $'97\n98\n99' | from-code-point --split /\r?\n/
 
     # Escaped...
     $ echo -n $'97\n98\n99' | from-code-point --split /\\r?\\n/
     ```
 
 -   The implementation ignores trailing delimiters.
 
 </section>
 
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 ### Examples
 
 ```bash
 $ from-code-point 9731
 ☃
 ```
 
 To use as a [standard stream][standard-streams],
 
 ```bash
 $ echo -n '9731' | from-code-point
 ☃
 ```
 
 By default, when used as a [standard stream][standard-streams], the implementation assumes newline-delimited data. To specify an alternative delimiter, set the `split` option.
 
 ```bash
 $ echo -n '97\t98\t99\t' | from-code-point --split '\t'
 abc
 ```
 
 </section>
 
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 * * *
 
 ## See Also
 
 -   <span class="package-name">[`@stdlib/string/code-point-at`][@stdlib/string/code-point-at]</span><span class="delimiter">: </span><span class="description">return a Unicode code point from a string at a specified position.</span>
 
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 <section class="links">
 
 [code-point]: https://en.wikipedia.org/wiki/Code_point
 
 [standard-streams]: https://en.wikipedia.org/wiki/Standard_streams
 
 [mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
 
 [mdn-string-fromcharcode]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode
 
 [mdn-string-fromcodepoint]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint
 
 [utf-16]: https://en.wikipedia.org/wiki/UTF-16
 
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 [@stdlib/string/code-point-at]: https://github.com/stdlib-js/string/tree/main/code-point-at
 
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