A function that takes in a precise eth price and truncates it make it more readable

truncateEthPrice.js

/**
 * 
 * @param {string} price 
 * @returns {string}
 */
function truncatePrice(price){
  if(!price){
    return '0.00'
  }

  const zerosArr = [] // will contain all grouped 0s from beginning of the price ( and decimal )
  const priceArr = [...price] // will contain all relevant digits from price after the loop.
  while(priceArr[0] === '0' || priceArr[0] === '.'){
    zerosArr.push(priceArr.shift())
  }

  // if there are no zeroes in the beginning of the price, lets return the original price.
  if(zerosArr.length === 0){
    const [preDecimal, postDecimal] = price.split('.')

    if(!postDecimal){
      return preDecimal
    }

    return preDecimal + '.' + postDecimal?.slice(0, 3)
  }

  return zerosArr.join('') + priceArr.slice(0, 3).join('')
}



function truncAndLog(price){
  console.log('Full Price - ', price)
  console.log('Truncated Price - ', truncatePrice(price))
  console.log('-----------------------------------------')
}


truncAndLog("0.000342245989304813") // Output - 0.000342
truncAndLog("4.12310239842938") // Output - 4.123
truncAndLog("2.007") // Output - 2.007
truncAndLog("42") // Ouput - 42
truncAndLog("0") // Output - 0
truncAndLog("") // Output - 0.00