Tue, 16 Feb 2010 12:34:15 -0500, bearophile wrote: > Lars T. Kyllingstad: > >>I don't agree that immutable should be the the default. The default >>should be the most common case, which is mutable.< > > Is it true that mutables are the most common? > > Is it true that mutables will be the most common in D programs written > few years from now? You must design a language for tomorrow, not for > yesterday. > > Typing var " in the code is not that costly. While writing "immutable " > often in the code is a lot of typing. > > Scala e Clojure like immutables, they are good for multicores :-) > > I've done a small search of the "val" and "var" attributes in Scala > language: > > val (immutables): > http://www.google.com/codesearch?q=%22val%22+lang%3Ascala 29_300 > > var (variables): > http://www.google.com/codesearch?q=%22var%22+lang%3Ascala 15_200 > > It's not a scientific search, but shows that immutables are not that > uncommon in Scala.
Note that also function parameters are val in scala unlike in java or d. >From my experiences with various kinds of (functional) languages with first class functional features, const values become the common case. Why? Because everything can return a value, you don't need uninitialized references.
