.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/modules/es.string.at-alternative.js

   1 'use strict';
   2 var $ = require('../internals/export');
   3 var uncurryThis = require('../internals/function-uncurry-this');
   4 var requireObjectCoercible = require('../internals/require-object-coercible');
   5 var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
   6 var toString = require('../internals/to-string');
   7 var fails = require('../internals/fails');
   8
   9 var charAt = uncurryThis(''.charAt);
  10
  11 var FORCED = fails(function () {
  12   return '𠮷'.at(0) !== '\uD842';
  13 });
  14
  15 // `String.prototype.at` method
  16 // https://github.com/tc39/proposal-relative-indexing-method
  17 $({ target: 'String', proto: true, forced: FORCED }, {
  18   at: function at(index) {
  19     var S = toString(requireObjectCoercible(this));
  20     var len = S.length;
  21     var relativeIndex = toIntegerOrInfinity(index);
  22     var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex;
  23     return (k < 0 || k >= len) ? undefined : charAt(S, k);
  24   }
  25 });