hmm...I don't understand why clojure when and if simultaneously? What is the diffirences between them and when I should use one instead another one?
Disregarding all of the practical benefits (such as an implicit do): languages often incorporate apparently redundant constructs because one of the roles of a language is to communicate your higher-level intent.
Using (when (foo) (bar) (baz)) instead of (if (foo) (do (bar) (baz))) communicates some subtle distinctions to other programmers, despite their equivalence to the compiler: you're telling other humans that you didn't accidentally omit the 'else' clause; that you don't expect any code to run if the condition is false; that you're intentionally returning nil for false; that you're probably doing something with side-effects.
There are more subtle clues that you'll pick up in certain people's styles, too -- I'm sure my use of when has a very different pattern to a Java guy's, colored by my Common Lisp experience.
It would be a pretty dull programming language that doesn't allow you the leeway to express yourself.
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