Round function based on precision

round.js

 const MAP_NUM_TO_PRECISION = {
  '-5': 'Hundred Thousandths',
  '-4': 'Ten Thousandths',
  '-3': 'Thousandths',
  '-2': 'Hundredths',
  '-1': 'Tenths',
  '0': 'Ones',
  '1': 'Tens',
  '2': 'Hundreds',
  '3': 'Thousands',
  '4': 'Ten Thousands',
  '5': 'Hundred Thousands',
};

const round = ( n, precision, type = 'IT' ) => {

  const place = Math.pow(10, precision)

  let result = 0;

  if( type === 'UP' ){
    result = Math.ceil( n / place) * place;
  }
	else if( type === 'DOWN' ){
    result = Math.floor( n / place) * place;
  } else { 
    result = Math.round( n / place) * place;
	}
	console.log( 'Round:', n, type , 'to', MAP_NUM_TO_PRECISION[precision], 'place.. result',  result);
}

const num = 5134.050016

round(num, 0);
round(num, 0, 'UP');
round(num, 0, 'DOWN');

console.log('\n');
round(num, 1);
round(num, 1, 'UP');
round(num, 1, 'DOWN');

console.log('\n');
round(num, 2);
round(num, 2, 'UP');
round(num, 2, 'DOWN');

console.log('\n');
round(num, -1);
round(num, -1, 'UP');
round(num, -1, 'DOWN');

console.log('\n');
round(num, -2);
round(num, -2, 'UP');
round(num, -2, 'DOWN');