Question

How to get the fraction and exponent of a real number in Node.js

Answer 1

function frexp(value) {
  if (value === 0) return [0, 0];

  const exponent = Math.floor(Math.log2(Math.abs(value))) + 1;
  const fraction = value / Math.pow(2, exponent);
  
  return [fraction, exponent];
}

const d = 2.26;
const [fraction, exponent] = frexp(d);

console.log(`fraction = ${fraction.toFixed(3)} exponent = ${exponent}`);



/*
run:

fraction = 0.565 exponent = 2

*/

 

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