What is a var type in Dart?
Maria ElijahDart var type
In Dart, when a variable is declared as a var type, it can hold any value such as int and float.
The value of a var variable can not change within the program once it is initialized at declaration.
Syntax
var variable_name
Example 1
The following code shows how to implement the var type in Dart.
void main() {
var a; // declaring a variable of type var
a = 40; // initializing variable a
print(a);
a = "Dart"; // reassigning string value to `a`
print(a);
a = 10.4; // reassigning float value to `a`
print(a);
}Explanation
-
Line 1–11: We create the
main()function. Within themain(), we have the following:-
Line 2: A variable named
aofvartype. -
Line 3: We assign an
integervalue to it. -
Line 4: We print the value of
a. -
Line 6: We reassign a
stringvalue to it. -
Line 7: We print the value of
a. -
Line 9: We reassign a
floatvalue to it. -
Line 10: We print the value of
a.
-
Example 2
Let’s try initializing at the point of declaring the variable and then reassigning a value to it.
Note: The following code will throw an error.
void main() {
var a = 40;
print(a);
a = "Dart";
print(a); // Error: A value of type 'String' can't be assigned to a variable of type 'int'
}Explanation
If we initialize a variable of type var at the point of declaration, we can’t reassign a value to it.
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