Question

How to extract the last N bits of a 32-bit integer in TypeScript

Answer 1

function get_last_N_bits(num: number, N: number) {
    let mask: number = (1 << N) - 1;
         
    return num & mask;
}
 
const num: number = 441; // 00000001101-11001
const N: number = 5;
 
console.log(("0000000000000000" + num.toString(2)).substr(-16));
 
let lastNbits: number  = get_last_N_bits(num, N);
 
console.log(("0000000000000000" + lastNbits .toString(2)).substr(-16));
 
 
 
 
 
/*
run:
      
"0000000110111001" 
"0000000000011001" 
      
*/

 

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