--- /dev/null
+var toInteger = require('../internals/to-integer');
+var requireObjectCoercible = require('../internals/require-object-coercible');
+
+// `String.prototype.{ codePointAt, at }` methods implementation
+var createMethod = function (CONVERT_TO_STRING) {
+ return function ($this, pos) {
+ var S = String(requireObjectCoercible($this));
+ var position = toInteger(pos);
+ var size = S.length;
+ var first, second;
+ if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;
+ first = S.charCodeAt(position);
+ return first < 0xD800 || first > 0xDBFF || position + 1 === size
+ || (second = S.charCodeAt(position + 1)) < 0xDC00 || second > 0xDFFF
+ ? CONVERT_TO_STRING ? S.charAt(position) : first
+ : CONVERT_TO_STRING ? S.slice(position, position + 2) : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;
+ };
+};
+
+module.exports = {
+ // `String.prototype.codePointAt` method
+ // https://tc39.es/ecma262/#sec-string.prototype.codepointat
+ codeAt: createMethod(false),
+ // `String.prototype.at` method
+ // https://github.com/mathiasbynens/String.prototype.at
+ charAt: createMethod(true)
+};