programming-examples/Test if a number is a power of 2.js at 8258e10e80f15a440e8fdcf2cec04c76ed334301 - programming-examples - michuIT: Everything is code

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 function power_of_2(n) {
  if (typeof n !== 'number')
       return 'Not a number';
     return n && (n & (n - 1)) === 0;
 }
 console.log(power_of_2(16));
 console.log(power_of_2(18));
 console.log(power_of_2(256));