Answers for "how to preserve 20 digits after decimal js"

remove decimals javascript

Math.floor(5.9) //5
Math.ceil(5.1) //6
Math.round(9.5) //10
5.3 >> 0 //5 (same as Math.floor)
7.9 >> 0 //7 (same as Math.floor)

get the integer after decimal in javascript

const number = 2.3;
const numberAfterDecimal = parseInt((number % 1).toFixed(2).substring(2));
const numberBeforeDecimal = parseInt(number);

console.log("value before decimal", numberBeforeDecimal);
console.log("value after decimal", numberAfterDecimal);