use a regular expression like this  

​

var strNumber = "0049";  

console.log(typeof strNumber); //string  

var number  = strNumber.replace(/^0+/, ''); 

function removeTrailingZerosAndPad(integer) {

  // Convert to a string, remove trailing zeros, and pad with zeros to ensure at least three digits

  const stringWithoutZeros = integer.toString().replace(/0+$/, '');

  const paddedInteger = stringWithoutZeros.padStart(3, '0');

  return Number(paddedInteger);

}

​

// Example usage:

const originalInteger = 35000000;

const modifiedInteger = removeTrailingZerosAndPad(originalInteger);

​

console.log(modifiedInteger); // Output: 350