Category:Arturo: Difference between revisions
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|site=http://arturo-lang.io
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'''Arturo''' is a general-purpose, multi-paradigm language that aims to be simple, modern and powerful, vaguely inspired by various other ones - including but not limited to [[Ruby]], [[Haskell]], [[D]], [[SDL]] (Simple Declarative Language), [[Tcl]] and [[Lisp]].
===Principles===
It is built on some very simple and straightforward principles:
====Everything is a simple statement====
There are no "special" language constructs (''even <code>if</code> is nothing but a simple statement''). Everything you see is a statement in the form <code>ID <expression> <expression> <expression> ...</code>
====Code is data - and data is code====
Arturo can be used both as a data-interchange format and a programming language. Basically all data structures are valid code and all code can be represented as a data structure. Think of it as [[SDL]]/[[Json]]/[[YAML]]/[[XML]] combined with the power of [[Lisp]] - but without the... sea of opening and closing parentheses.
====Each statement returns a value====
Whether what you would consider a "function" or any other statement, it will return a value. If it's a block of code (see: ''function''), the last statement's result will be return - unless specified otherwise.
====Functions are first-class citizens====
Functions - or blocks of statements enclosed in <code>{}</code> - can be anything. Assign them to a symbol/variable, pass them around as arguments to function calls, include them as a dictionary key value, or return them from a function. And of course they can be either named or anonymous/lambda.
====Uniform syntax====
As already mentioned, everything is a statement of the form `ID <expressions>`. So, how does this work?
* Is it the first time you are declaring this symbol? Then, the right-hand value will be assigned.
* Is it not the first time? Then again, the right-hand value will be assigned.
* Do you want to call a function you have declared, by name? Just prefix it with an exclamation mark. E.g.: <code>!myFunc "some arg" "another arg"</code>
* Do you want to use the result of a function call as part of an expression? Just enclose the function call in <code>$(...)</code> E.g.: <code>print $(reverse #(1 2 3))</code>
===Implementation===
The main Arturo interpreter is written in the [[D]] language.
===License===
Arturo is released under the [[MIT/X11 License]].
===Todo===
[[Reports:Tasks_not_implemented_in_Arturo]]
{{language programming paradigm|Imperative}}
{{language programming paradigm|Object-oriented}}
{{language programming paradigm|Functional}}
{{language programming paradigm|Reflective}}
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