Question

How to determining if an integer is a power of 2 in JavaScript

Answer 1

function get_bits(n){
    return (n >>> 0).toString(2);
}

var n = 16;
  
document.write(get_bits(n) + "<br />");
document.write(get_bits(n - 1) + "<br />");
document.write(get_bits(n & (n - 1)) + "<br />");

var b = (n & (n - 1)) === 0;

document.write(b);
     

   
/*
run:
    
10000
1111
0
true 
     
*/

 

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