concat returns a lazy sequence. user=> (doc concat) ————————- clojure.core/concat ([] [x] [x y] [x y & zs]) Returns a lazy seq representing the concatenation of the elements in the supplied colls. you can convert it back to a vector with into: user=> (into [] (concat [1 2] [3 4] [5 6])) [1 2 3 … Read more
You can just use apply again: (apply addnums args)
== is for comparing numbers. If either of its arguments is not a number, it will always return false: (== :a :a) ; => false As you can see by saying (clojure.contrib.repl-utils/source ==) at the REPL (with repl-utils require‘d, of course), == calls the equiv method of clojure.lang.Numbers. The relevant bit of clojure/lang/Numbers.java (from the … Read more
Require require loads a Clojure library so that you can use it in your current file or REPL. This is the normal way to access functions and definition in a Clojure library. Use use brings in a Clojure namespace in the same way as require, but in addition it refers to the definitions in the … Read more
core.clj is built from top to bottom, starting with just what Java provides and building up all the requirements for Clojure as it goes. When when is defined the syntax quote does not yet exist. The when macro is defined on line 456 of core.clj and the requirements for syntax-quote are not available until line … Read more
I think andih’s solution works great. Here is an alternate way because hey why not. It uses concat and distinct: user> (distinct (concat ‘(1 2 3) ‘(2 3 4))) => (1 2 3 4)
You can just use seq function to do this: user=> (seq “aaa”) (\a \a \a) for numbers you can use “dumb” solution, something like: user=> (map (fn [^Character c] (Character/digit c 10)) (str 12345)) (1 2 3 4 5) P.S. strings in clojure are ‘seq’able, so you can use them as source for any sequence … Read more
You can generate Maven’s POM out of Leiningen’s project definition and then use Maven’s dependency:tree plugin with a verbose option, like this: $ lein pom $ mvn dependency:tree -Dverbose=true This will list dependencies omitted for various reasons, e.g.: | +- ring:ring-core:jar:1.4.0:compile | | +- (org.clojure:clojure:jar:1.5.1:compile – omitted for conflict with 1.7.0) | | +- (org.clojure:tools.reader:jar:0.9.1:compile … Read more
General intro: Symbols in any Lisp are used as identifiers. If you’re going to refer to the value of a variable, say, you need to have a way of naming it; that’s what symbols are for. Remember that all Lisp code gets translated at read time to Lisp data structures; identifiers must also be represented … Read more
just use or: (or input-argument “default”)