032 final vs const |
n Flutter, final and const have similar meanings as in other programming languages, but there are some differences between them.
final and const are used to declare immutable values. final is evaluated at runtime and its value can only be set once, while const is evaluated at compile-time and its value must be a compile-time constant. Here are some examples:
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final String name = 'John'; // evaluated at runtime
const int age = 30; // evaluated at compile-time
In the example above, name can be assigned a value at runtime, while age must be assigned a value that is known at compile-time.
const is also used to declare immutable lists, maps, and sets, like this:
In summary, final is used when the value is not known until runtime and cannot be changed after it is set, while const is used when the value is known at compile-time and cannot be changed at runtime.
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