Clojure: Hello, World!
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.
Instructions
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.
The exercise doesn't pass checking. What to do? 😶
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
- Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨
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.
My code is different from the teacher's one 🤔
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.
I've read the lessons but nothing is clear 🙄
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.