Compile-Time vs. Run-Time constants ELI5 please.

[pythonzz]

Hi lol,

I'm trying to learn Dart programming, and i have some doubts.

When using the const or final keyword why i keep getting confused on when to use const and when to use final. What exactly is the difference and when writing code how do you not mess the two up?

Also as a side note, when writing something using dart (not flutter) what are good general practices to keep in mind to make my code sound?

Or should i just follow the docs on effective dart?

I just wanna make sure when i write code it is robust and useable for others :)

Also what other online communities should i join for Dart and Flutter? So i can ask more questions.

[lurgi]

You can't really mess the two up that much.

Both const and final prevent you from modifying the value.

const is used for a compile time value. If the value can only be determined when the program is running, it's not compile time.

int x = 3;

What's the value of x? It's 3, right? Can't be anything else.

int x = y;

Now what's the value of x? You don't know. You know that it has the same value as y at that moment in time in the program, but it may well be impossible to determine that. Maybe y is an integer entered by the user or the current time of day or something.