adding exercise for step 7

step2-07/exercise/src/components/TodoFooter.tsx

@@ -0,0 +1,45 @@
+import React from 'react';
+import { Text } from '@uifabric/experiments';
+import { Stack } from 'office-ui-fabric-react';
+import { Store } from '../store';
+import { DefaultButton } from 'office-ui-fabric-react';
+import { connect } from 'react-redux';
+import { actions } from '../actions';
+
+// TODO: after connecting to view, erase the ?'s
+interface TodoFooterProps {
+  clear?: () => void;
+  todos?: Store['todos'];
+}
+
+export const TodoFooter = (props: TodoFooterProps) => {
+  const itemCount = Object.keys(props.todos).filter(id => !props.todos[id].completed).length;
+
+  return (
+    <Stack horizontal horizontalAlign="space-between">
+      <Text>
+        {itemCount} item{itemCount > 1 ? 's' : ''} left
+      </Text>
+      <DefaultButton onClick={() => props.clear()}>Clear Completed</DefaultButton>
+    </Stack>
+  );
+};
+
+/*
+TODO: uncomment this and fill out the below code
+
+function mapStateToProps(state: Store) {
+  // TODO: FILL THIS OUT
+}
+
+function mapDispatchToProps(dispatch: any) {
+  // TODO: FILL THIS OUT
+}
+
+const component = connect(
+  mapStateToProps,
+  mapDispatchToProps
+)(TodoFooter);
+
+export { component as TodoFooter };
+*/