mardi 11 décembre 2018

Lazy evaluation in Go

My understanding of lazy evaluation is that an expression is only called when needed. Is Go lazily evaluated?

For instance, would I get better performance on average from:

if !isValidQueryParams(&queries) || r == nil || len(queries) == 0 {
    return "", fmt.Errorf("invalid querystring")
}

...to this:

if r == nil || len(queries) == 0 || !isValidQueryParams(&queries) {
    return "", fmt.Errorf("invalid querystring")
}

...since isValidQueryParams is a function with much more overhead than r == nil or testing the length of a map?

i.e. will the interpreter evaluate r == nil first, see it's true and not bother to evaluate the other conditions?

Aucun commentaire:

Enregistrer un commentaire