When to use doall and dorun in Clojure

The lazy sequence in Clojure is a confusing part for many beginners, especially when it used together with side effects. The catch is, depends on the actual way by which the lazy sequence is consumed, the items in the sequence can be fully, partially or completely not consumed. If there is no side effect operation in the items, nothing .

Clojure return rest of string after a sub string

You have a sub string used as delimiter in another string, how to get the rest string after the delimiter? You can calculate the end position of the sub string and then cut the string from the position or split the string by the sub string, the following code shows how to do it.

(subs "hello world" (+ (.indexOf "hello world" "hello") (.length "hello")))
(nth (clojure.string/split  "hello world" #"hello") 1)

Combine multiple PDF files into single PDF file in Clojure

want. Here is how to combine pdf files into one file (defn read-pdf-bytes [file-path ... , it's better to pack them together into a single PDF file. I'd used the clj-pdf to pack a set ... of merge-pdf function (defn merge-pdfs "merge multiple PDFs into output file" [& {:keys ... . Such as saving a slide which consists of a series of orderd images, or a newspaper provided as PDF files

How to invoke Java method in Clojure

[Call overloaded Java methods] I get this problem, I want to call the get method ... is represented as array, in Java if there is no variable length parameter we just omit it, but in Clojure, we ... need to specify it explicitly to make it match the type signature of Java method, we need to pass ... of java.nio.file.Paths from clojure, I tried a lot of options, but I always get this error cannot be cast

Clojure list files from folders and append to file

for this problem is list all files from all the sources and append to a big text file, then open ... (println "appending from source:" s) (append-to-file out-file (string-list-files-rec s ... search the big file list with multi-occur command in Emacs. Prepare two bat files ls.bat @echo ... to append." [file-name s] (spit file-name s :append true)) (defn generate-big-list

Insertion Sort in Clojure

In Insertion Sort, insert means search and find the position of current element ... . The code is listed as below. (defn insertion-sort [a] (loop [rest-part a partial-sorted ... ))) ) ) ) ) ) (insertion-sort '( 1 4 223 3 2 4 23 45 5 43 3 12 113 1)) The output. user ... > (insertion-sort '( 1 4 223 3 2 4 23 45 5 43 3 12 113 1)) ["rest-part" (1 4 223 3 2 4 23 45 5 43 3

Clojure cons, conj and concat

Manipulating lists and vectors in Clojure usually involves three functions: cons, conj ... and concat. Learn to use them helps you deal with list and vectors more efficiently. [cons two ... slots can be anything ELISP> (cons 2 '(3)) (2 3) ELISP> (cons 2 2) (2 . 2) In Clojure ... :505) It prepends the first parameter to the collection. [conj works on collection] Clojure

Convert XML to HTML with XSLT in Clojure

Convert XML to HTML with XSLT, using javax.xml package. (defn xslt-transform [xml xslt ... . (java.io.StringReader. xml))) tfactory (javax.xml.transform.TransformerFactory/newInstance ... ) xslt-source (javax.xml.transform.stream.StreamSource. (java.io.StringReader. xslt ... )) transformer (.newTransformer tfactory xslt-source) source

Java IO PushbackReader example in Clojure

to pushback chars back to the stream or look ahead. For example the Clojure programming language ... A PushbackReader can wrap a stream from file, string or standard input. PushbackReader ... then wrapped in a LineNumberingPushbackReader. [Create a PushbackReader] Let's define a PushbackReader ... on a String in Clojure (def pbr (java.io.PushbackReader. (java.io.InputStreamReader
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