1 var toInteger = require('./_to-integer')
2 , defined = require('./_defined');
4 // false -> String#codePointAt
5 module.exports = function(TO_STRING){
6 return function(that, pos){
7 var s = String(defined(that))
11 if(i < 0 || i >= l)return TO_STRING ? '' : undefined;
13 return a < 0xd800 || a > 0xdbff || i + 1 === l || (b = s.charCodeAt(i + 1)) < 0xdc00 || b > 0xdfff
14 ? TO_STRING ? s.charAt(i) : a
15 : TO_STRING ? s.slice(i, i + 2) : (a - 0xd800 << 10) + (b - 0xdc00) + 0x10000;