Question

How to count the total bits of a number that equal to one (1) in JavaScript

Answer 1

function get_bits(num) {
    return (num >>> 0).toString(2);
}
 
function count_bits(num) { 
    let count = 0;

    while (num) { 
        count += num & 1; 
        num >>= 1;
    } 
    
    return count; 
} 
 
 
const num = 1358; // 010101001110
  
console.log(get_bits(num));
console.log(count_bits(num));
 
   
   
  
/*
run:
    
10101001110
6 
     
*/

 

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Answer 2

function getTotalOneBits(num) {
    const binary = num.toString(2);
    
    return [...binary].filter(el => el === '1').length;
}


let num = 1358; 
console.log(getTotalOneBits(num)); // 010101001110

num = 45;
console.log(getTotalOneBits(num)); // 00101101




/*
run:

6
4

*/

 

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