function getByKeyPath()

in public/dexie.js [130:150]

• 20 lines of code
• 7 McCabe index (conditional complexity)

  function getByKeyPath(obj, keyPath) {
    // http://www.w3.org/TR/IndexedDB/#steps-for-extracting-a-key-from-a-value-using-a-key-path
    if (hasOwn(obj, keyPath)) return obj[keyPath]; // This line is moved from last to first for optimization purpose.
    if (!keyPath) return obj;
    if (typeof keyPath !== "string") {
      var rv = [];
      for (var i = 0, l = keyPath.length; i < l; ++i) {
        var val = getByKeyPath(obj, keyPath[i]);
        rv.push(val);
      }
      return rv;
    }
    var period = keyPath.indexOf(".");
    if (period !== -1) {
      var innerObj = obj[keyPath.substr(0, period)];
      return innerObj === undefined
        ? undefined
        : getByKeyPath(innerObj, keyPath.substr(period + 1));
    }
    return undefined;
  }