Not sure where the convention first arose, but definitely not in Ruby. Scheme (1975) used trailing ! for side-effect containing functions and ? for predicates. For example, see SICP [1].
[1] https://mitpress.mit.edu/sicp/full-text/book/book.html On Jun 22, 2014, at 09:13 , Ben Coman wrote: > > There was a previous thread [1] that involved discussion of the naming > convention for methods doing "dangerous" in-place mutatation - e.g. > sort/sorted, reverse/reversed - and even though I now know there is such a > naming convention, its hard to keep track of which is which. > Now today I happened to be looking for the first time at some Ruby code and > came across their naming convention for "dangerous" methods of having a > trailing exclamation mark - e.g. sort/sort!, reverse/reverse! - which is > REALLY intuitive. How extreme is it to wonder if Pharo might some day be > able to support such a convention? > > [1] > http://forum.world.st/11635-Race-condition-in-SequenceableCollection-gt-gt-shuffle-td4709752.html >
