Consider a parameterless (edit: not necessarily) function that performs a single line of code, and is called only once in the program (though it is not impossible that it'll be needed again in the future).

It could perform a query, check some values, do something involving regex... anything obscure or "hacky".

The rationale behind this would be to avoid hardly-readable evaluations:

if (getCondition()) {
    // do stuff
}

where getCondition() is the one-line function.

My question is simply: is this a good practice? It seems alright to me but I don't know about the long term...