codePointAt

Return a Unicode code point from a string at a specified position.

Usage

var codePointAt = require( '@stdlib/string/code-point-at' );

codePointAt( string, position[, backward] )

Returns a Unicode code point from a string at a specified position.

var out = codePointAt( 'last man standing', 4 );
// returns 32

The function supports providing a boolean argument for performing backward iteration for low surrogates.

var out = codePointAt( '🌷', 1, true );
// returns 127799

Notes

This function differs from String.prototype.codePointAt in the following ways:

The function supports providing a boolean argument for performing backward iteration for low surrogates. String.prototype.codePointAt simply returns the low surrogate value if no UTF-16 surrogate pair begins at the specified position. If invoked with backward set to true, this function will return the code point after aggregating with the preceding high surrogate, if the specified position does not mark the start of a surrogate pair.

Examples

var codePointAt = require( '@stdlib/string/code-point-at' );

console.log( codePointAt( 'last man standing', 4 ) );
// => 32

console.log( codePointAt( 'presidential election', 8, true ) );
// => 116

console.log( codePointAt( 'अनुच्छेद', 2 ) );
// => 2369

console.log( codePointAt( '🌷', 1, true ) );
// => 127799

CLI

Usage

Usage: code-point-at [options] [<string>] --pos=<index>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
  -b,    --backward            Backward iteration for low surrogates.
         --pos index           Position in string.

Examples

$ code-point-at --pos=2 अनुच्छेद
2369

To use as a standard stream,

$ echo -n 'अनुच्छेद' | code-point-at --pos=2
2369