Do you often use the Flutter null check operator “!”?

So, after flutter version 2.0, they have announced null safety functionality. Now if you have null value then you need to make it non nullable if you want to use that. Or Another option is check that if (val != null) then do something.

Here are some of the example which will help you to understand null safety

1. Using the null-aware operator (?.):

The null-aware operator allows you to use properties or call methods on an object only if that object is not null. This operator is helpful when you want to avoid null errors.
Example:

Widget build(BuildContext context) {
  String? name; // Nullable variable

  return Text(name?.toUpperCase() ?? 'Unknown');
}

In the above example, if name is null, the toUpperCase() method will not be called, and the default value ‘Unknown’ will be displayed instead.

2. Using conditional statements (if-else):

You can use conditional statements to check if a variable is null and perform different actions based on the result.
Example:

Widget build(BuildContext context) {
  String? name; // Nullable variable

  if (name != null) {
    return Text(name.toUpperCase());
  } else {
    return Text('Unknown');
  }
}

In this case, if name is null, the ‘Unknown’ text will be displayed; otherwise, the uppercase version of name will be shown.

3. Using the null coalescing operator (??):

The null coalescing operator allows you to provide a default value if a variable is null. It returns the left-hand operand if it’s non-null; otherwise, it evaluates and returns the right-hand operand.

Example:

Widget build(BuildContext context) {
  String? name; // Nullable variable

  return Text(name?.toUpperCase() ?? 'Unknown');
}

This is similar to the first example with the null-aware operator, where ‘Unknown’ is the default value if name is null.