Question 246562 in Javascript Question posted in
A very good W3school tutorial can be found here.

JavaScript: formatting decimal that starts at hundredths and below

I need to handle values like this

0.00 //Show as is
0.45 //Show as is
0.002 //Need to show 0.002 or 0.0020
0.0003 //Need to show 0.0003 or 0.00030
0.00004 //Need to show 0.00004 or 0.000040
0.00234567 //Need to show 0.0023

We are not able to make it work on fractional part where a non zero value started at thousandth place and always ended up displaying 0.00 as if it is totally a zero value. We still want the above formatting with comma when dealing with whole number but also allowing us to format when non zero starts beyond hundredths place.

Further sample

0.0492 // 0.04 or 0.05 much better
700.356 // 700.35 or 700.36 much better
54232.542234 // 54,232.54

ChatGPT solution on this is messy and doesn’t cover all the cases presented above.

function formatCurrency(number) {
  const decimalPlaces = (Math.abs(number) % 1).toString().split('.')[1]?.length || 0;
  let minimumFractionDigits = decimalPlaces;
  let maximumFractionDigits = decimalPlaces;

  // Special case for numbers greater than or equal to 1
  if (Math.abs(number) >= 1) {
    minimumFractionDigits = 2;
    maximumFractionDigits = 2;
  } else if (decimalPlaces > 2) {
    minimumFractionDigits = 4;
    maximumFractionDigits = 4;
  } else if (decimalPlaces === 0) {
    minimumFractionDigits = 2;
    maximumFractionDigits = 2;
  }

  const formattedNumber = number.toLocaleString('en-US', {
    style: 'currency',
    currency: 'USD',
    minimumFractionDigits: minimumFractionDigits,
    maximumFractionDigits: maximumFractionDigits,
  });

  return formattedNumber.replace(/.0+$/, ''); // Remove trailing zeros
}

console.log(formatCurrency(0.00));
console.log(formatCurrency(0.45));
console.log(formatCurrency(0.002));
console.log(formatCurrency(0.0003));
console.log(formatCurrency(0.00004));
console.log(formatCurrency(0.00234567));
console.log(formatCurrency(54232.542234));
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2

Answers


  1. 0

    I have no idea how ai halluci

    This might be the answer you are looking for:

    function formatNumber(num) {
    // Function to remove trailing zeroes
    function removeZeroes(number) {
        return number.replace(/(.d*?)0{0,2}$/, '$1');
    }

    // Function to add commas to a number
    function addCommas(number) {
        return number.toString().replace(/B(?=(d{3})+(?!d))/g, ",");
    }

    if (num < 1) {
        return removeZeroes(num.toFixed(4));
    } else {
        return addCommas(num.toFixed(2));
    }
}


// Test cases

console.log(formatNumber(0.00));
console.log(formatNumber(0.45));
console.log(formatNumber(0.002));
console.log(formatNumber(0.0003));
console.log(formatNumber(0.00004));
console.log(formatNumber(0.00234567));
console.log(formatNumber(0.0492));
console.log(formatNumber(700.356));
console.log(formatNumber(54232.542234));

    I recently learned somethiing related to this so I myself can use it aswell.

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  2. 0

    This will store two decimal places:

    function formatCurrency(yourNumber) {
    return Number(yourNumber).toFixed(2);
}

    Note that it won’t ‘only format decimal hundredths or below’ since JS doesn’t store 0.0 and 0.00 differently. So, it would print both as 0.00

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