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"JSFuck is an esoteric and educational programming style" How exactly is this educational?

by talles 13y ago

MattBearman 13y ago
I took the 'educational' to mean 'this should never be used in a real application' :)
- talles 13y ago
  If someone cogitates to use this for real... it shouldn't be doing it anything at all.
- a3voices 13y ago
  Unless you consider cross-site scripting attacks to be applications.
prezjordan 13y ago
It teaches you the funky behavior of JavaScript. For instance, `[]["filter"]` returns an empty function called filter. In order to get particular characters (for example: f), the script uses "false"[0], where "false" is derived from adding ![] + [], and 0 is derived from +[]. Putting all of that together ($ node): > (![]+[])[+[]] 'f'
- adamb_ 13y ago
  Not sure that []["filter"] is all that funky of an example as it's just grabbing the arrays prototype method "filter" using bracket notation. Here's some better examples of JS oddities: http://stackoverflow.com/q/9032856/1538708 http://stackoverflow.com/q/9032856/1538708
  - kshay 13y ago
    The funkiness is really that []["filter"]["constructor"] is a function that behaves like eval(), or rather, it returns a function that when called executes the string that was passed to the constructor function. That's how they're actually running the code. > []["filter"]["constructor"]("alert(1)")()
ctdonath 13y ago
By demonstrating creative abuse of a language, one can better understand what the language constructs do and the scope of their capability. The comparable IOCCC.org contest is a great place to learn C: sure the primary focus is making obfuscated code, and the audience marvels at the bizarreness thereof, but taking the time to pick a submission apart and figure out why it works (despite a host of reasons why you'd think it shouldn't) expands your understanding of the language. It's a great way to improve your language skills when you've reached the initial "I know language X" confidence.

"JSFuck is an esoteric and educational programming style" How exactly is this educational?

by talles 13y ago

"JSFuck is an esoteric and educational programming style" How exactly is this educational?

MattBearman 13y ago

I took the 'educational' to mean 'this should never be used in a real application' :)

talles 13y ago
If someone cogitates to use this for real... it shouldn't be doing it anything at all.
a3voices 13y ago
Unless you consider cross-site scripting attacks to be applications.

prezjordan 13y ago

It teaches you the funky behavior of JavaScript. For instance, `[]["filter"]` returns an empty function called filter. In order to get particular characters (for example: f), the script uses "false"[0], where "false" is derived from adding ![] + [], and 0 is derived from +[]. Putting all of that together ($ node): > (![]+[])[+[]] 'f'

adamb_ 13y ago
Not sure that []["filter"] is all that funky of an example as it's just grabbing the arrays prototype method "filter" using bracket notation. Here's some better examples of JS oddities: http://stackoverflow.com/q/9032856/1538708 http://stackoverflow.com/q/9032856/1538708
- kshay 13y ago
  The funkiness is really that []["filter"]["constructor"] is a function that behaves like eval(), or rather, it returns a function that when called executes the string that was passed to the constructor function. That's how they're actually running the code. > []["filter"]["constructor"]("alert(1)")()

ctdonath 13y ago

By demonstrating creative abuse of a language, one can better understand what the language constructs do and the scope of their capability. The comparable IOCCC.org contest is a great place to learn C: sure the primary focus is making obfuscated code, and the audience marvels at the bizarreness thereof, but taking the time to pick a submission apart and figure out why it works (despite a host of reasons why you'd think it shouldn't) expands your understanding of the language. It's a great way to improve your language skills when you've reached the initial "I know language X" confidence.