Now that we have
var it is 5-character long and I believe it is a big deal actually. Something that even slightly takes longer to type (and read) affects our coding experience.
My question would be - say, one is trying to come up with some completely new programming language (so, no backwards compatilibity burden) and you still wan't save
let for mutable variables, what shorter keyword will you use for consts?
UPD: an answer "I would still go with const because..." is a perfectly valid answer as well.
UPD: people, come on. The very existence of const (not constant) as a keyword is an evidence of that length really matters. The very existence of
val in Scala is an evidence of trying to rethink what keywords for what should be used.