Find the Harmonic Mean code-golf The harmonic mean of a sequence of numbers is the reciprocal of the arithmetic mean of the reciprocal of each number. For example, the harmonic mean of [1, 2, 3] is 1/((1/1+1/2+1/3)/3) = 3/(1/1+1/2+1/3). Input A list/array/tuple/string with some delimeter/etc...

Write a Brainfuck interpreter with a twist! Input The input can be in any way you like but must include these: A character (no duplicates) for all six of the default brainfuck commands: Move the pointer to the right (>) Move the pointer to the left (<) Increment the memory cell under the p...

Your task is to write a program that, given a number n, returns a list of all valid, halting Smallfuck programs of length n, in any order. Actually, we're using a variation of Smallfuck called F2, which is just Smallfuck with a right-unbounded tape. For the purposes of this challenge, a program ...

Shuffle a string code-golf string Your challenge is to shuffle the characters of a string. Input A string of any length. Output The inputted string with its characters mixed around. Rules Your program must never output its input if there are more than 3 unique characters in the string. Yo...

Hello World with only numbers code-golf restricted-source Your challenge is to print the string "Hello, World!" followed by a newline. The catch is that you may only use numbers in your source code. Rules Your program may only use the characters 1 2 3 4 5 6 7 8 9 0 in its source code. Your p...