--- /dev/null
+// Based on: https://github.com/mathiasbynens/String.prototype.codePointAt
+// Thanks @mathiasbynens !
+
+'use strict';
+
+var toInteger = require('../../../number/to-integer')
+ , validValue = require('../../../object/valid-value');
+
+module.exports = function (pos) {
+ var str = String(validValue(this)), l = str.length, first, second;
+ pos = toInteger(pos);
+
+ // Account for out-of-bounds indices:
+ if (pos < 0 || pos >= l) return undefined;
+
+ // Get the first code unit
+ first = str.charCodeAt(pos);
+ if ((first >= 0xD800) && (first <= 0xDBFF) && (l > pos + 1)) {
+ second = str.charCodeAt(pos + 1);
+ if (second >= 0xDC00 && second <= 0xDFFF) {
+ // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
+ return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
+ }
+ }
+ return first;
+};