What does ~fs.readdirSync mean in config files?

2018-06-26 20:00:07

This question already has an answer here:

What does a tilde do when it precedes an expression? 6 answers

~ is the bitwise NOT operator NOT. Every bit in x is inverted in ~x . For instance:

 x = 00011011
~x = 11100100

Alternatively, it is equivalent to doing XOR with 0xFFFFFFFF (all 1-bits):

     00011011
 XOR 11111111
     --------
   = 11100100

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