Excellent Programming Tricks

04/11/2024

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23/10/2024

? (Null-aware Operator) Vs ! (Null Assertion Operator)
Null-aware Operator(?) - Safely access a property or method of an object that might be null, without throwing an error if it is null.
String? name; int? length = name?.length; // length will be null if name is null
Null Assertion Operator(!) - A value must not be null; otherwise, it will throw a NoSuchMethodError.
String? name; if (name != null) { print(name!); } // Commonly used when you have checked for null

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19/10/2024

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

https://excellentprogrammingtricks.blogspot.com/2024/10/flutter-tips-and-tricks.html

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09/04/2022

08/04/2022