Gas optimization: Constant and Immutable.

[EddiePumpin]

Can Constant and Immutable be used interchangeably?

[AmarRam90]

I think not, because 'constant' I believe must be used when you are declaring and initializing the variable simultaneously, 'immutable' is used when you plan to initialize it later in another function, most likely a 'constructor'. Correct me if I am wrong, please

[OleksiiLavrov]

I guess, you are right. Constants can't be reassigned or assigned later in code, but immutable can be set in constructor.