-var toInteger = require('../internals/to-integer');
+var uncurryThis = require('../internals/function-uncurry-this');
+var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
+var toString = require('../internals/to-string');
var requireObjectCoercible = require('../internals/require-object-coercible');
-// `String.prototype.{ codePointAt, at }` methods implementation
+var charAt = uncurryThis(''.charAt);
+var charCodeAt = uncurryThis(''.charCodeAt);
+var stringSlice = uncurryThis(''.slice);
+
var createMethod = function (CONVERT_TO_STRING) {
return function ($this, pos) {
- var S = String(requireObjectCoercible($this));
- var position = toInteger(pos);
+ var S = toString(requireObjectCoercible($this));
+ var position = toIntegerOrInfinity(pos);
var size = S.length;
var first, second;
if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;
- first = S.charCodeAt(position);
+ first = charCodeAt(S, 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;
+ || (second = charCodeAt(S, position + 1)) < 0xDC00 || second > 0xDFFF
+ ? CONVERT_TO_STRING
+ ? charAt(S, position)
+ : first
+ : CONVERT_TO_STRING
+ ? stringSlice(S, position, position + 2)
+ : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;
};
};