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''''Defunc''' is a [[:Category:Functional_paradigm|function-based]], minimalist [[esoteric programming language]] currently developed by [[User:Obvious]]. The language operates on functions that return integers. These functions can vary in input size. Its name comes from a portmanteau of "define" and "function" ==Predefined functions== The language consists of 5 functions, which are as follows: {| class="wikitable plainpres" |- ! Function !! Description |- | <code>0</code> || Returns a 0 |- | <code>+a</code> || Returns a+1 |- | <code>?abcd</code> || If a>b, return c, otherwise return d |- | <code>.a</code> || Writes a to the console, while returning it (Note: Defunc will output the actual integer and does not support ASCII) |- | <code>,</code> || Requests user input in the form of an integer |} Every function only evaluates the necessary arguments, meaning that <code>?abcd</code> will evaluate a, b, and one out of c and d. This also includes writing to the console. <code>?0.a0b</code> can therefore be used to write a and return b. ==Other functions== Apart from the predefined functions, there are other functions as well. In a program you are able to define your own function, within the constraints of the programming language. To define a function, take a character that is not yet defined as a function or variable as the function name, then take any amount of characters that are not defined as a function for the variable names, and then give the function it should return. For example: <code>>ab?abab</code> defines a <code>></code> function with variables <code>a</code> and <code>b</code> and outputs the greater. Functions can refer to earlier functions, but also to themselves, to create a loop. You could for example write a sum function as <code>Sabi?biS+ab+ia,</code> which increments a and the counter variable i, until i reaches b. Then it returns a, which by then had b increments applied to it. Usually in execution, a 0 should take the place of i, to assure a complete addition. Note that these functions will automatically query all <code>,</code> even if they will not be used. ==Other Syntax== Anything must return exactly one argument. <code>Iaa</code> is valid, as <code>Ia</code> returns <code>a</code>, but <code>Iaaa</code> is not, as it would imply <code>Ia</code> returns <code>aa</code>, which are two arguments and not one. You should use a line break to separate the definitions/calculations. Not everything has to be a definition. Executing a function has to be done as well. ==Examples== ===[[Hello, world!]]=== 4a++++a Ba44444444a LBBB4440 .+4444444.BB440 ..L .+++L .+++44444BB.B0 .+++.+++L .L .BBB40 .+B0 Due to output restrictions this will only output the decimal form of the ASCII codes ===[[Cat program|Cat]]=== C?0.,0C C The input is restricted to an integer ===[[Fibonacci sequence]]=== Sabc?bcS+ab+ca Fab?0.a0FbSab0 F0+0 ===[[Factorial]]=== Arci?ciA+rc+ir *ab?b0Aa*aA0b+000 !a?a+0*a!A0a+0+0 .!, ===[[Ackermann function]]=== -ab?a+b-a+bb Aab?a0?b0A-a0Aa-b0A-a0+0+b .A,, ===[[Truth-machine]]=== Ta?.a0Ta0 T, ==External resources== * [https://github.com/Ob3vious/Esolang_defunc Official interpreter] [[Category:Languages]] [[Category:Functional_paradigm]] [[Category:2021]] [[Category:Unknown computational class]]'