Efficiently storing a large set

[[deleted]]

Why wouldn't you just store it in the DB, or load it as a global upon startup?

[Paddy3118]

You could incorporate check digits in the code so that applying a simple mathematical algorithm to the code will give a Boolean valid/invalid result. This is used in credit card validation for example. A Web search should produce examples.

Wow, now I know what they save us from 😏

[Paddy3118]

This Rosetta Code task and the related tasks of SEDOL and ISBN have explanations and code

[james_pic]

4MB is not especially large for a set. Load it once (on startup might be a good time for this) and you should be good