Common data types
Read moreWhat does late in flutter mean?
late to field means that the field will be initialized when you use it for the first time .
Read moreWhat is final class in flutter?
“final” means single-assignment : a final variable or field must have an initializer. Once assigned a value, a final variable’s value cannot be changed. final modifies variables. “const” has a meaning that’s a bit more complex and subtle in Dart.
Read moreWhat is dart lazy?
Lazy initialization is now part of dart from the release 2.12 . Simply add late modifier to the variable declaration. late MyClass obj = MyClass(); And this object will be initialized only when it is first used.
Read moreHow do you fix null check operator used on a NULL value Flutter?
Solution 3: Using Fallback Operator : Here, “str” is null, and we set the fallback operator with fallback value in case of “str” is null. You need to do this before using it on the code. You can use this method to handle Null values to escape the “Null check operator used on a null value” error in Flutter or Dart.
Read moreHow do you use late keyword in darts?
Use the late keyword to initialize a variable when it is first read, rather than when it’s created . It’s common to use late in combination with final , to defer the creation of read-only variables to when they are first read.
Read moreWhat is a null check operator?
The nullish coalescing operator ( ?? ) is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined , and otherwise returns its left-hand side operand .
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