Questions tagged [code-golf]

Code-golf is a competition to solve a particular problem in the fewest bytes of source code.

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262
votes
145answers
84k views

Tips for golfing in Python

What general tips do you have for golfing in Python? I'm looking for ideas which can be applied to code-golf problems and which are also at least somewhat specific to Python (e.g. "remove comments" is ...
30
votes
13answers
9k views

Tips for golfing in 05AB1E

Do you have any tips for code-golfing in 05AB1E, a golfing language created by Adnan? Your tips should be at least somewhat specific to 05AB1E. Please post one tip per answer.
87
votes
38answers
21k views

Tips for golfing in Java

Are there any useful shortcuts that can be used in Java? As shown below, import already adds at least 17 characters to a program. ...
432
votes
774answers
134k views

“Hello, World!”

So... uh... this is a bit embarrassing. But we don't have a plain "Hello, World!" challenge yet (despite having 35 variants tagged with hello-world, and counting). While this is not the most ...
204
votes
340answers
46k views

Golf you a quine for great good!

Using your language of choice, golf a quine. A quine is a non-empty computer program which takes no input and produces a copy of its own source code as its only output. No cheating -- that means ...
76
votes
51answers
12k views

Tips for golfing in Haskell

What general tips do you have for golfing in Haskell? I am looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to Haskell. Please post only one ...
82
votes
35answers
9k views

Tips for golfing in <all languages>

The aim of this post is to gather all the golfing tips that can be easily applied to <all languages> rather than a specific one. Only post answers that its ...
144
votes
53answers
26k views

Tips for golfing in C

What general tips do you have for golfing in C? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to C (e.g. "remove comments" is not an ...
46
votes
43answers
4k views

Tips for golfing in PowerShell

What general tips do you have for golfing in Windows PowerShell? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to PowerShell (e.g. "...
137
votes
80answers
42k views

Tips for golfing in JavaScript

What general tips do you have for golfing in JavaScript? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to JavaScript (e.g. "remove ...
65
votes
53answers
14k views

Tips for code-golfing in C#

What general tips do you have for golfing in C#? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to C# (e.g. "remove comments" is not an ...
202
votes
298answers
47k views

Is this number a prime?

Believe it or not, we do not yet have a code golf challenge for a simple primality test. While it may not be the most interesting challenge, particularly for "usual" languages, it can be nontrivial in ...
90
votes
38answers
12k views

Tips for Golfing in ECMAScript 6 and above

This is similar to other "Tips for golfing in <...>" but specifically targeting the newer features in JavaScript brought up in ECMAScript 6 and above. JavaScript inherently is a very verbose ...
257
votes
63answers
71k views

We're no strangers to code golf, you know the rules, and so do I

Write the shortest program that prints the entire lyrics of "Never Gonna Give You Up" by Rick Astley. Rules: Must output the lyrics exactly as they appear in the above pastebin*. Here's the raw dump:...
42
votes
32answers
5k views

Tips for golfing in Mathematica

What general tips do you have for golfing in Mathematica? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to Mathematica (e.g. "remove ...
59
votes
19answers
5k views

Tips for golfing in R

I'm looking for tips for golfing in the R statistical language. R is perhaps an unconventional choice for Golf. However, it does certain things very compactly (sequences, randomness, vectors, and ...
64
votes
50answers
19k views

Tips for golfing in Ruby

What general tips can you give for golfing in Ruby? I'm looking for ideas that can be applied to code golf problems in general that are specific to Ruby. (For example, "Remove comments" would not be ...
56
votes
35answers
7k views

Tips for golfing in Bash

What general tips do you have for golfing in Bash? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to Bash (e.g. "remove comments" is not ...
47
votes
18answers
10k views

Tips for golfing in Perl?

What general tips do you have for golfing in Perl? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to Perl (e.g. "remove comments" is not ...
116
votes
246answers
28k views

Fibonacci function or sequence

The Fibonacci sequence is a sequence of numbers, where every number in the sequence is the sum of the two numbers preceding it. The first two numbers in the sequence are both 1. Here are the first ...
56
votes
103answers
12k views

List of primes under a million

This is my first code golf question, and a very simple one at that, so I apologise in advance if I may have broken any community guidelines. The task is to print out, in ascending order, all of the ...
37
votes
39answers
8k views

Tips for golfing in PHP

What general tips do you have for golfing in PHP? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to PHP (e.g. "remove comments" is not ...
20
votes
12answers
1k views

Tips for golfing in MATL

MATL is a golfing language created by Luis Mendo. MATL has proven to be highly competitive, often beating submissions in other golfing languages such as Pyth, CJam and Jelly. What are some useful ...
152
votes
280answers
43k views

1, 2, Fizz, 4, Buzz

Introduction In our recent effort to collect catalogues of shortest solutions for standard programming exercises, here is PPCG's first ever vanilla FizzBuzz challenge. If you wish to see other ...
46
votes
17answers
11k views

Tips for golfing in Jelly

Jelly is a tacit, golf-oriented programming language by our very own Dennis. It’s popping up in answers here more and more often, beating other golf-y languages like Pyth and CJam, both by using its ...
36
votes
17answers
4k views

Tips for golfing in GolfScript

What, this post doesn't exist yet? Of course, GolfScript is made for golfing, so you might think that no specific tips are really needed. But to make full use of GolfScript's features, you need to ...
52
votes
27answers
13k views

Tips for golfing in C++

What general tips do you have for golfing in C++? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to C++ (e.g. "remove comments" is not ...
37
votes
15answers
4k views

Golf a mutual quine

Using two languages of your choice, write the smallest “mutual quine” you can. That is, write a program P in language A that outputs the source code for a program Q in language B, such ...
30
votes
12answers
3k views

Tips for golfing in APL

I started one code golf challenge recently and it seems like the winner is GolfScript (surprise, surprise!). What's interesting is that there was another very strong competitor that had all chances to ...
125
votes
125answers
38k views

Obfuscated Hello World

Create the shortest possible obfuscated program that displays the text "Hello World". In order to be considered an obfuscated program, it must meet at least two of the following requirements: Does ...
86
votes
268answers
17k views

Simple cat program

One of the most common standard tasks (especially when showcasing esoteric programming languages) is to implement a "cat program": read all of STDIN and print it to STDOUT. While this is named after ...
43
votes
34answers
3k views

Tips for golfing in CJam

CJam is a GolfScript-inspired stack-based golfing language, created by PPCG user aditsu. So, in the vein of other language-specific tips questions: What general tips do you have for golfing in CJam? ...
16
votes
33answers
3k views

Tips for golfing in VBA

Similar to this, this, and this question... What general tips do you have for golfing in VBA? I'm looking for ideas that can be applied to code golf problems in ...
585
votes
281answers
215k views

Produce the number 2014 without any numbers in your source code

Note to challenge writers as per meta consensus: This question was well-received when it was posted, but challenges like this, asking answerers to Do X without using Y are likely to be poorly ...
130
votes
132answers
18k views

I double the source, you double the output!

Your task, if you wish to accept it, is to write a program that outputs a positive integer (higher than 0). The tricky part is that if I duplicate your source code, the output must be double the ...
22
votes
13answers
3k views

Converting integers to English words

The goal of this code golf is to convert integers to English words. The program prompts for input. If this input isn't an integer, print NaN. If it is an integer,...
14
votes
8answers
1k views

Tips for golfing in whitespace

What general tips do you have for golfing in Whitespace? I'm looking for ideas which can be applied to code-golf problems and which are also at least somewhat specific to Whitespace (e.g. "remove ...
114
votes
53answers
17k views

Interpret brainf***

Write the shortest program in your favourite language to interpret a brainfuck program. The program is read from a file. Input and output are standard input and standard output. Cell size: 8bit ...
150
votes
388answers
28k views

Implement a Truth-Machine

A truth-machine (credits goes to this guy for coming up with it) is a very simple program designed to demonstrate the I/O and control flow of a language. Here's what a truth-machine does: Gets a ...
35
votes
52answers
7k views

Generate Pascal's triangle

Pascal's triangle is generated by starting with a 1 on the first row. On subsequent rows, the number is determined by the sum of the two numbers directly above it to the left and right. To ...
124
votes
484answers
37k views

Shortest infinite loop producing no output

Your task is to create the shortest infinite loop! The point of this challenge is to create an infinite loop producing no output, unlike its possible duplicate. The reason to this is because the code ...
47
votes
194answers
14k views

Add two numbers

Input: Two integers. Preferably decimal integers, but other forms of numbers can be used. These can be given to the code in standard input, as arguments to the program or function, or as a list. ...
76
votes
183answers
16k views

Find the Factorial!

Create the shortest program or function that finds the factorial of a non-negative integer. The factorial, represented with ! is defined as such $$n!:=\begin{...
60
votes
39answers
4k views

Write the shortest self-identifying program (a quine variant)

Write a program that will generate a "true" output iff the input matches the source code of the program, and which generates a "false" output iff the input does not match the source code of the ...
85
votes
133answers
11k views

Determine whether strings are anagrams

Challenge Given two strings, work out if they both have exactly the same characters in them. Example Input word, wrdo This returns true because they are the ...
58
votes
100answers
8k views

Reverse stdin and place on stdout

Requirements: Take an input on stdin including new lines / carriage returns of unlimited length (only bounded by system memory; that is, there is no inherent limit in the program.) Output the reverse ...
57
votes
34answers
5k views

Are the brackets fully matched?

You must write a program or function that takes a string of brackets and outputs whether or not that string is fully matched. Your program should print a truthy or falsy value, and IO can be in any ...
74
votes
149answers
17k views

“99 Bottles of Beer”

Write a program that outputs the lyrics to 99 Bottles of Beer, in as few bytes as possible. Lyrics: ...
77
votes
88answers
13k views

Print this diamond

This question has been spreading like a virus in my office. There are quite a variety of approaches: Print the following: ...
30
votes
22answers
3k views

Tips for golfing in x86/x64 machine code

I noticed that there's no such question, so here it is: Do you have general tips for golfing in machine code? If the tip only applies to a certain environment or calling convention, please specify ...

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