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