What is the final keyword in Dart?
Overview
In dart, the final keyword is used to define immutable constants or objects. It is a runtime constant.
Syntax
// Without datatype
final variable_name;
// With datatype
final data_type variable_name;
Example
The following code shows how to implement the final keyword:
void main(){// declaring final variablefinal int num = 10;//calculating the sum and assign to variable sumint sum = num * num;// displaying resultprint(sum);}
Let’s try reassigning the value for variable num in the following code:
void main(){// declaring final variablefinal int num = 10;//calculating the sum and assign to variable sumint sum = num * num;// displaying resultprint(sum);// reassigning variable numnum = 20;print(num);}
Note: If we try to reassign the variable
numthen it will display an error.
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