Clojure is a modern dialect of Lisp that encourages functional programming. The language uses the JVM platform. Like all Lisp-like languages, it is homoiconicity (code as data). Sometimes Clojure is called a pragmatic Lisp, because in addition to the advantages of Lisp, the language combines features of the JVM, which simplifies the creation of programs (there are even features for scripting with Clojure!). For a better understanding of the philosophy of the language, it is worth reading the report Simple Made Easy by Rich Hickey, the creator of the language.
Traditionally, we will begin by writing a program called "Hello, World! This program will display text on the screen:
Hello, World!
To print something on the screen, you need to call a function (a symbolic expression). In Clojure, (println some-str)
function is used, where some-str
is a string enclosed in double quotes.
Copy the exact code from the instructions into the editor and run it by clicking “Run”.
(println "Hello, World!")
Note that if you type hello, woRld! instead of Hello, World!, it will count as different text, because upper and lowercase letters are different symbols in Clojure. Letter size is called case, and any programmer will tell you that case is important. This rule affects almost everything in coding, so make sure you get used to paying close attention to the case at all times.
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.
It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.
In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.
It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.
By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.