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edited Aug 15, 2017 at 14:48

Jelly, 2 bytes1 byte

&Ṡ&

I think I understood the challenge.

&Ṡ  Main link
&   Bitwise AND; returns 0 if k at n is 0 and n otherwise
 Ṡ  Sign; 0 -> 0 and n -> 1

If output doesn't have to be consistent for truthy/falsy, then simply & works.Bitwise AND Builtin

&Ṡ

I think I understood the challenge.

&Ṡ  Main link
&   Bitwise AND; returns 0 if k at n is 0 and n otherwise
 Ṡ  Sign; 0 -> 0 and n -> 1

If output doesn't have to be consistent for truthy/falsy, then simply & works.

Bitwise AND Builtin

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created Aug 15, 2017 at 14:24

&Ṡ

I think I understood the challenge.

&Ṡ  Main link
&   Bitwise AND; returns 0 if k at n is 0 and n otherwise
 Ṡ  Sign; 0 -> 0 and n -> 1

If output doesn't have to be consistent for truthy/falsy, then simply & works.