Function createPointAt

lib/web/polyfill.js:326–338

(toString)

  }
}
function createPointAt(toString){
  return function(pos){
    var s = String(assertDefined(this))
      , i = toInteger(pos)
      , l = s.length
      , a, b;
    if(i < 0 || i >= l)return toString ? '' : undefined;
    a = s.charCodeAt(i);
    return a < 0xd800 || a > 0xdbff || i + 1 === l || (b = s.charCodeAt(i + 1)) < 0xdc00 || b > 0xdfff
      ? toString ? s.charAt(i) : a
      : toString ? s.slice(i, i + 2) : (a - 0xd800 << 10) + (b - 0xdc00) + 0x10000;
  }
}

// Assertion & errors
var REDUCE_ERROR = 'Reduce of empty object with no initial value';