Slightly simplify the code

Author: gaearon

src/components/createConnect.js

@@ -11,9 +11,6 @@ const defaultMergeProps = (stateProps, dispatchProps, parentProps) => ({
   ...stateProps,
   ...dispatchProps
 });
-const defaultOptions = {
-  pure: true
-};
 
 function getDisplayName(Component) {
   return Component.displayName || Component.name || 'Component';
@@ -26,7 +23,7 @@ export default function createConnect(React) {
   const { Component, PropTypes } = React;
   const storeShape = createStoreShape(PropTypes);
 
-  return function connect(mapStateToProps, mapDispatchToProps, mergeProps, options) {
+  return function connect(mapStateToProps, mapDispatchToProps, mergeProps, options = {}) {
     const shouldSubscribe = Boolean(mapStateToProps);
     const finalMapStateToProps = mapStateToProps || defaultMapStateToProps;
     const finalMapDispatchToProps = isPlainObject(mapDispatchToProps) ?
@@ -35,7 +32,7 @@ export default function createConnect(React) {
     const finalMergeProps = mergeProps || defaultMergeProps;
     const shouldUpdateStateProps = finalMapStateToProps.length > 1;
     const shouldUpdateDispatchProps = finalMapDispatchToProps.length > 1;
-    const finalOptions = {...defaultOptions, ...options} || defaultOptions;
+    const { pure = true } = options;
 
     // Helps track hot reloading.
     const version = nextVersion++;
@@ -92,7 +89,7 @@ export default function createConnect(React) {
         };
 
         shouldComponentUpdate(nextProps, nextState) {
-          return !finalOptions.pure || !shallowEqual(this.state.props, nextState.props);
+          return !pure || !shallowEqual(this.state.props, nextState.props);
         }
 
         constructor(props, context) {