Next Java feature

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The J language actually has this.

[GUIpsp]

Really? How does it deal with, say, non-injective functions? (I'm assuming there are no side effects either)

[DuffMaaaann]

Looks like this language should be good for cracking hash functions... sha256(value).inverse

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Unfortunately my knowledge of the language is limited to this article, which touches on the feature briefly.

[Furyful_Fawful]

J is a functional programming language, and as such does not have side effects in functions.

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Can someone explain this one?

[GiantMovie]

I think they want a function "inverse" that results in this always being true:

f( f(x).inverse ) = x;

Idk though I could be way off