Question

How to check if all bits of a number are set in Node.js

Answer 1

function get_bits(n) {
    return (n >>> 0).toString(2);
}
   
function is_all_bits_set(n) {
   return (n + 1) & n;
}
   
let n = 7;
   
console.log(get_bits(n));
console.log(get_bits(n + 1));
console.log(get_bits((n + 1) & n));
if (is_all_bits_set(n) === 0) {
    console.log("Yes");
} else {
    console.log("No");
}
   
console.log();  
   
n = 12;
   
console.log(get_bits(n));
console.log(get_bits(n + 1));
console.log(get_bits((n + 1) & n));
 
if (is_all_bits_set(n) === 0) {
    console.log("Yes");
} else {
    console.log("No");
}
  
  
  
/*
run:
     
111
1000
0
Yes

1100
1101
1100
No
      
*/

 

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