Function isKey

test-app/public/sinon.js:16933–16944

* Checks if `value` is a property name and not a property path. * * @private * @param {*} value The value to check. * @param {Object} [object] The object to query keys on. * @returns {boolean} Returns `true` if `value` is a property name, else `false`.

(value, object)

         * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
         */
        function isKey(value, object) {
          if (isArray(value)) {
            return false;
          }
          var type = typeof value;
          if (type == 'number' || type == 'symbol' || type == 'boolean' ||
              value == null || isSymbol(value)) {
            return true;
          }
          return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
            (object != null && value in Object(object));
        }
    
        /**
         * Checks if `value` is suitable for use as unique object key.