Flowdock
hex() public

Treats leading characters from str as a string of hexadecimal digits (with an optional sign and an optional 0x) and returns the corresponding number. Zero is returned on error.

   "0x0a".hex     #=> 10
   "-1234".hex    #=> -4660
   "0".hex        #=> 0
   "wombat".hex   #=> 0
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