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- 'use strict';
- var $ = require('../internals/export');
- var uncurryThis = require('../internals/function-uncurry-this');
- var requireObjectCoercible = require('../internals/require-object-coercible');
- var toString = require('../internals/to-string');
- var charCodeAt = uncurryThis(''.charCodeAt);
- // `String.prototype.isWellFormed` method
- // https://tc39.es/ecma262/#sec-string.prototype.iswellformed
- $({ target: 'String', proto: true }, {
- isWellFormed: function isWellFormed() {
- var S = toString(requireObjectCoercible(this));
- var length = S.length;
- for (var i = 0; i < length; i++) {
- var charCode = charCodeAt(S, i);
- // single UTF-16 code unit
- if ((charCode & 0xF800) !== 0xD800) continue;
- // unpaired surrogate
- if (charCode >= 0xDC00 || ++i >= length || (charCodeAt(S, i) & 0xFC00) !== 0xDC00) return false;
- } return true;
- }
- });
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