This challenge is related to the JavaScript language. Note that challenges that require the answers to be in a specific language are generally discouraged.

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11
votes
3answers
161 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(), ...
4
votes
2answers
372 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 ...
-1
votes
2answers
306 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 ...
0
votes
1answer
348 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 ...
3
votes
5answers
335 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
608 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){...}.
15
votes
4answers
2k views

2048 king on the hill

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 ...
5
votes
2answers
240 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
312 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 ...
10
votes
1answer
412 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 ...
-1
votes
1answer
321 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
666 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
1k 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 ...
21
votes
11answers
2k views

Make StackOverflow Explode (bookmarklet)

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 ...
7
votes
4answers
542 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
252 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
160 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 ...
1
vote
10answers
1k 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
571 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. ...
16
votes
15answers
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 ...
2
votes
3answers
3k 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
1k 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, ...
43
votes
40answers
7k 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 ...
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 ...
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, ...
10
votes
4answers
12k 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 ...