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Color-shift an image code-golf image-processing Input An image. This can be represented in a number of ways, including: an image object, a 2D array of pixels, a 3D array of the color channels of eac …

Wait, ASCII was 128 characters all along? This question was posted.

Reduce them to schwa! (title from the comments on this video) code-golf string Challenge Given a string of printable ASCII characters (0x20 to 0x7E), replace each character in aeiouAEIOU with ə (U+025 …

Arrow Chain Reaction code-golf grid Challenge Given a 2D grid of spaces, inactive arrows (lowercase udlr) and one active arrow (uppercase UDLR), start an "arrow chain reaction". The active arrow move …

ALU: addition, subtraction, multiplication, division code-golf arithmetic Challenge Given two integers \$a, b\$ in \$[0, 256)\$ and a number \$c\$ from the set \$\{0, 1, 2, 3\}\$, perform an operation …

Find the nth occurrence of a character code-golf string Challenge Given a string s, a character c, and a number n, return the position of the nth occurrence of c in s. If c does not have an nth occurr …

There's a reason hashes aren't short code-golf hashing Challenge Given a string s, return the SHA-256 hash of s. Builtins that solve this exact challenge aren't allowed, but everything else is allowed …

Pick and Flip code-golf array Challenge Given an array of integers, perform the Pick and Flip algorithm, which is defined like this: Set n to 1 (if 1-indexed) or 0 (if 0-indexed). Set i to the n-th e …