I'm very new by the way

< is not generic

it only works on Number

try using compare

(also there's a #beginners channel)

thanks

I see it doesn't work on other stuff, I just don't understand the syntax. Like what is 0 and 1 supposed to be in this case, is it a reference to the arguments?

0 means equal, less than or greater than 0 tells you which arg is larger https://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html

it works on anything implementing the above interface

thanks!

You mean less than or greater than 0 :)

oh yes, of course, thanks

I was thinking 0 and typed 1

Also see https://clojure.org/guides/comparators

what's a good shorthand for "combinator" i.e. something that takes two or more things and creates a new thing out of it

@qqq reducer?

How do I import Incanter properly? I have this in my profiles.clj [incanter "1.9.1"] and I get this error: Could not transfer artifact org.clojure:clojure:pom:1.3.0-alpha2 from/to clojure (http://build.clojure.org/releases): Ac cess denied to: http://build.clojure.org/releases/org/clojure/clojure/1.3.0-alpha2/clojure-1.3.0-alpha2.pom , ReasonPhra se:Forbidden. This could be due to a typo in :dependencies or network issues. If you are behind a proxy, try setting the 'http_proxy' environment variable.

If I remove the import it works fine

@harkonnen My first guess would be that there is a transitive dependency somewhere in incanter to clojure-1.3.0-alpha2 which cannot be accessed. You can check that by showing all dependencies with leiningen. You could try to exclude clojure-1.3.0-alpha2 from the incanter dependency. I only wonder, you say you have the dependency in your profiles.clj and not project.clj?

@hiredman could it be the sharing that clojure does when reading strings?

What does the _ mean in anonymous function in this code:

clojure
(clojure.string/replace "mississippi" #"(.)i(.)"
                        (fn [[_ b a]]
                          (str (clojure.string/upper-case b)
                               "--"
                               (clojure.string/upper-case a))))
;;=> "M--SS--SS--Ppi"

@sveri I assumed that if I put it in there I don't have to have it in every single project.clj... 😄

@harkonnen :dependencies [[clj-time "0.8.0" :exclusions [org.clojure/clojure]] [org.clojure/clojure "1.9.0-alpha14"] [incanter "1.9.1" :exclusions [clj-time joda-time org.clojure/clojure org.clojure/clojure-contrib org.clojure/core.cache org.clojure/math.combinatorics]] ] :pedantic? :abort

it's better using R by JRI

Doesn't seem to work... when I just use this :dependencies [ [org.clojure/clojure "1.8.0"] [incanter "1.9.0" :exclusions [clojure-1.3.0-alpha2]] ] then lein deps works

incanter 1.9.0 has a bug

must be 1.9.1

Okay, thanks

Apparently my problem is with ancient and plz

If I comment out everything else then it works

Well, at least it works now. Thanks!

:pedantic? :abort let all lib using a new edition

let R as DB, JRI as JDBC, R lang

as SQL

all thing will simple, Example

Hi, advise the development ide or editor with plugin for clojure, thanks

@fantomofdoom Cursive is a good IDE. ProtoREPL+Atom is good. Vim+Fireplace is good. Emacs+Cider is good.

@dominicm Thanks

@dominicm I thought it was the reader, but I after @alexmiller said I was I wrong I looked at the code and the only string interning that happens is in the compiler

user=> (apply identical? (read-string "[\"foo\" \"foo\"]"))
false
user=> 

I'm looking for a html->markdown convertor lib , do you know any ?

Is that possible? Theres a lot in HTML that doesn't match directly to markdown

yeah but i'm going to parse simple html text

@vitruvia (< 0 1) is always true, so the function is your snippet is equivalent to (fn [a b] b), and reducing it over a sequence will always return the last item.

The metadata on function vars I'm currently seeing. Is that part of clojure core? Cider nrepl? Something else? Curious in it's availability for tooling.

it's something clojure.core does and the basis of most of the useful editor tooling

it's also useful directly in the repl, it's how clojure.repl/source, clojure.repl/doc etc. work

Mmhm, I knew it was there. I just wanted to confirm it was a feature of clojure.core. I'm working on a fork of bikeshed, and I want to enhance some output.