Flutter | Tips and tricks

1. What is Predicate?
1. Is a function return true or false.
2. What is WidgetBuilder?
1. It is a function that accepts context(BuildContext) as a parameter and returns dynamic widget(s).
3. BuildContext VS WidgetBuilder VS ItemBuilder VS Builder  [Dynamic nature]
   
1. BilderContext - Can allow access to other widgets and properties of the tree. It also holds the location of a widget | object.
2. WidgetBuilder - Create a new widget (single) based on the BuilderContext | function.
1. typedef WidgetBuilder = Widget Function(BuildContext context);
3. ItemBuilder-  Create a new list of widgets (ListView, GridView where each item is intexed) based on the BuilderContext location representations | function.
1. typedef ItemBuilder = Widget Function(BuildContext context, int index);
4. Builder - Create a new child [widget] using the WidgetBuilder function based on the BuildContext parameter | widget.