This challenge is related to the JavaScript language. Note that challenges that require the answers to be in a specific language are generally discouraged.
62
votes
17answers
3k views
Red vs. Blue - Pixel Team Battlebots
This is a king-of-the-hill contest, but instead of everyone fighting against each other, there will be two teams that compete: Red and Blue. Only one will be the winner.
The team you are on depends ...
68
votes
14answers
4k views
Making Future Posts Runnable Online with Stack Snippets
Stack Snippets were recently added to PPCG! Reminiscent of JSFiddle, Stack Snippets allow HTML, CSS, and JavaScript to be run directly in posts!
Here is a very simple Stack Snippet:
alert('This ...
0
votes
4answers
412 views
JavaScript: Tricks to shorten onkeydown, setInterval etc
Are there any tricks to shorten defined function names like setInterval, onkeydown, onkeyup, createLinearGradient or even return?
When using it more than once it's nice to put it as a string into a ...
44
votes
50answers
9k 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 ...
17
votes
5answers
442 views
Tips for Golfing in ECMAScript 6
This is similar to other "Tips for golfing in <...>" but specifically targeting the ECMAScript 6 features in JavaScript.
JavaScript inherently is a very verbose language, function(){}, .forEach(), ...
16
votes
19answers
2k views
Javascript: Create a 10x10 array of 1s
Obviously this challenge would be trivial with separate functions and libraries, so they aren't allowed.
Your code must conform to an ECMAscript specification (any spec will do), so no ...
0
votes
2answers
583 views
Babylon.js - loop through a scene and apply a simple fragment shader to all of the objects
You have a library - a fully loaded 2014 Babylon.js.
You have a fragment shader - let's call it sample.fragment.fx.
You have a scene - loaded ahead of time, possibly from a .babylon JSON file.
Your ...
4
votes
6answers
1k views
Print all odd numbers from 0 to 100000
My teacher gave me a simple problem which I should solve with a code tiny as possible. I should print all odd numbers from 0 to 100000 into a HTML document using javascript.
for(var y = 0; y < ...
7
votes
3answers
609 views
Forcing the Horse
This is a simple one: create the shortest browser script to change every appearance of force on a web page into horse. This script needs to be able to be pasted into the console and work on most ...
15
votes
3answers
708 views
JSFuck Golf - Hello World
JSFuck is an esoteric language in which any Javascript statement can be accurately reproduced into another valid Javascript program that uses only the 6 characters []()!+.
The JSFuck converter, when ...
1
vote
3answers
1k views
Check If Two or More Variables Are All Equal to Zero in JavaScript
What is the shortest way to check if two or more variables are equal to 0 in JavaScript?
I'm curious to know if there's something shorter than if(!x&&!y&&!z){...}.
14
votes
4answers
15k views
Shortest URL regex match in JavaScript
Create the shortest regular expression that will roughly match a URL in text when run in JavaScript
Example:
"some text exampley.com".match(/your regular expression goes here/);
The regular ...
-4
votes
1answer
339 views
Append element to array only if it exists?
I know that, given an array a and an element e, a.push(e) appends it. However, consider an object o and the following code:
// o = {...}
var a = [o.one];
a.push(o.two);
Assuming o.one = 1 and o.two ...
26
votes
11answers
2k views
Make StackOverflow Explode (bookmarklet) [closed]
Sometimes people get frustrated on the StackExchange network (specifically SO).
Your task is to create a bookmarklet that causes StackOverflow to explode/implode/destroy in some fashion. This will ...
4
votes
1answer
321 views
Javascript: Mini Space Invaders
I'm pretty new to code golfing, so I gave one of my first shots to a space invader clone called "Invas!on". It's a little less than 500 bytes, fully ASCII generated, and covers moving around and ...
5
votes
2answers
699 views
¿Yo Quiero jQuery?
The Setup
You are given a simple web page with 11 elements:
10 input elements with IDs i1 thru i10, in order
one output element with ID out
The input elements have value attributes defined in the ...
-1
votes
2answers
126 views
Move the “post your answer” form next to the question on SE sites
I have a problem when posting an answer to a question that already have several answers and/or several comments:
The "post your answer" form sits on bottom, the answer is on top. There is an awful ...
15
votes
4answers
895 views
Program a 2048 AI using an existing Framework
EDIT : Recently, my question has been proposed as a duplicate of 2048 Bot Challenge. I would like to stress that this question is different from that question, and will require answers to be ...
3
votes
1answer
242 views
multiplication table in javascript [duplicate]
This javascript code:
for(x=1;x<6;x++)for(y=1;y<6;y++)console.log((y==1?'\n':'')+x+'*'+y+'='+x*y);
prints the following:
1*1=1
1*2=2
1*3=3
1*4=4
1*5=5
2*1=2
2*2=4
2*3=6
2*4=8
2*5=10
3*1=3
...
15
votes
4answers
3k views
2048 Bot Challenge
We have been cloning 2048, analyzing 2048, but why haven't we played it yet? Write a 555 byte javascript snippet to play 2048 automatically, the best score after an hour will count (see scoring ...
40
votes
3answers
3k views
What can you do in a 4k data URI?
Bounty is over, thephpdeveloper wins with Conway's Game of Life
The web platform today is advancing at a rapid rate. Features like CSS3 animations, transforms, drop shadows and gradients, ...
-1
votes
2answers
334 views
Linking without a Link
Introduction
Hello! This is my second post, and I decided to do one which is more language specific, since my last one was very much orientated towards mathematical languages, and thus did not leave ...
3
votes
5answers
360 views
Increment Bitwise
Make a function that increments a number using only bitwise, loops, and conditions.
Rules:
All entries must be as per the language spec defined below.
Scoring is not of code length, but of the ...
2
votes
3answers
5k views
Shortest code to check if a number is in a range in JavaScript
This is how I checkout to see if a number is in a range (in between two other numbers):
var a = 10,
b = 30,
x = 15,
y = 35;
x < Math.max(a,b) && x > Math.min(a,b) // -> ...
0
votes
4answers
2k views
Make an HTML page goto infinite loop?
Write a code using HTML, JavaScript, jQuery to make the page go into infinite loop.
Restrictions:
No looping or control structures of javascript and jQuery allowed. You can only use alert, events, ...
5
votes
2answers
280 views
2D javascript table graphics
The challenge
Make a JavaScript program that can use a HTML table as a canvas, having each cell a pixel.
You can either input the position and color values in a form or by using the console.
Score ...
7
votes
3answers
355 views
Refactor variable names in JavaScript code
Your challenge today is to refactor JavaScript code. You will take three strings as input; a JavaScript string, a old variable name, and the name you want to refactor it to. For example, an input of
...
4
votes
2answers
1k views
Smallest Javascript CSS Selector Engine
Create a small acceptably efficient JS CSS selector engine. Standard css 2.0 properties should be supported in Firefox 3.0+,Safari , Opera, IE7+, and extra brownie points for IE6 support.
Smallest ...
1
vote
10answers
2k views
Convert JSON string to Key / Value Arrays
Convert JSON (key/value pairs) to a native arrays of keys & values, in your language.
var X = '{"a":"a","b":"b","c":"c","d":"d","e":"e","f":"f9","g":"g2","h":"h1"}';
The value array could be ...
2
votes
9answers
630 views
Implement String.prototype.toLowerCase()
Implement String.prototype.toLowerCase()
Description
The toLowerCase method returns the value of the string converted to lowercase. toLowerCase does not affect the value of the string itself.
...
10
votes
1answer
460 views
JavaScript load and SHA-256
This is a code golf puzzle with a real-world application. Some current browsers, if you enter a URL that looks like
data:text/html,<script>alert("hi")</script>
will execute the given ...
0
votes
1answer
424 views
Compressing a DNA-like string [closed]
my app is multiple choice test, where for each question the response results in a 4 letter string "eg" GTAC or ATGC or CATG, etc. There are always just 24 questions. so the final result is something ...
-1
votes
4answers
937 views
Find the longest word in a sentence without using regex [closed]
Have a function LongestWord(sen) take the sen parameter being passed and return the largest word in the string. If there are two or more words that are the same length, return the first word from the ...
0
votes
3answers
2k views
javascript: smallest code to convert seconds to time [closed]
Given seconds like 11728, write the smallest javascript function that returns a string like 3hrs. 15min. 28sec.
signature textTime([int] t,[bool] z,[bool] m)
t is the time like 11728 and you can ...
7
votes
4answers
591 views
Display a bézier curve in the browser
The goal is to display a bézier curve in any classical browser (except maybe old IE versions, because... are they really browsers?) client side.
Rules:
You must provide one or more files (or their ...
8
votes
2answers
271 views
Write the shortest text getter/setter on an element for the DOM
Just like jQuery's $.fn.text, write one or two functions that can get and set the text on an element.
You can't use textContent or innerText, and even less innerHTML.
Plain javascript. No DOM ...
-2
votes
1answer
190 views
IPv4 “in subnet” function [closed]
Implement the following JavaScript method as short as possible:
function same_subnet(ip_a,ip_b,sn_mask)
{
}
It should get 2 IP addresses and a subnet mask. It should return true if ip_a and ip_b ...
