How to enhance precision by adding decimal places using JavaScript

Question

How to enhance precision by adding decimal places using JavaScript

I have an integer number 439980.

I want to add a decimal point two places from the right, so it becomes 4399.80.

The length of the number can vary, but I always need it to show two decimal places from the right.

Any suggestions on how I can achieve this?

Thank you!

javascript formatting decimal

Answer 1

Answer №1

 const addDecimal = (number) => {
    return (number / 100).toFixed(2);
 }

Answer 2

 const addDecimal = (number) => {
    return (number / 100).toFixed(2);
 }

Answer 3

Answer №2

To add on, the toFixed() method will actually return a string value. So, if you need an integer instead, you'll have to apply one more filter. You can simply wrap the result from nnnnnn's function with Number() to convert it into an integer:

function insertDecimal(num) {
   return Number((num / 100).toFixed(2));
}

insertDecimal(99552) //995.52
insertDecimal("501") //5.01

The downside here is that JavaScript will eliminate trailing '0's. For example, 439980 will become 4399.8 instead of 4399.80 as expected:

insertDecimal(500); //5

If you're just displaying the results, then nnnnnn's initial version works perfectly!

observations

The Number function in JavaScript may produce unexpected outcomes for certain inputs. To bypass using Number, you can coerce the string value to an integer by utilizing unary operators: unary operators

return +(num / 100).toFixed(2);

or simply multiply by 1 like this:

return (num / 100).toFixed(2) * 1;

Fun fact: JavaScript's fundamental math system can be quite peculiar

Answer 4

To add on, the toFixed() method will actually return a string value. So, if you need an integer instead, you'll have to apply one more filter. You can simply wrap the result from nnnnnn's function with Number() to convert it into an integer:

function insertDecimal(num) {
   return Number((num / 100).toFixed(2));
}

insertDecimal(99552) //995.52
insertDecimal("501") //5.01

The downside here is that JavaScript will eliminate trailing '0's. For example, 439980 will become 4399.8 instead of 4399.80 as expected:

insertDecimal(500); //5

If you're just displaying the results, then nnnnnn's initial version works perfectly!

observations

The Number function in JavaScript may produce unexpected outcomes for certain inputs. To bypass using Number, you can coerce the string value to an integer by utilizing unary operators: unary operators

return +(num / 100).toFixed(2);

or simply multiply by 1 like this:

return (num / 100).toFixed(2) * 1;

Fun fact: JavaScript's fundamental math system can be quite peculiar

Answer 5

Answer №3

Another Approach

  function convertToDecimal(num){

    var leftSide = num.toString().replace('.', ''),
        rightSide = '00';
    
    if(leftSide.length > 2){          
      rightSide = leftSide.slice(-2);
      leftSide = leftSide.slice(0, -2);
    }
    
    var result = Number(leftSide+'.'+rightSide).toFixed(2);        
    return (result === "NaN") ? num:result        
  }

 convertToDecimal(3) // 3.00

 convertToDecimal(32) // 32.00

 convertToDecimal(334) // 3.34

 convertToDecimal(13e+1) // 1.30

Or you can try this:

    function addDecimalPlaces(num){
        var result = num.toString();
        result = result.split('.');
        if(result[1] == undefined){
            result[1] = '00';
        }
        if(result[1].length == 1){
            result[1] = result[1]+'0';
        }
        return result[0]+'.'+result[1];
    }

addDecimalPlaces(1); // 1.00

addDecimalPlaces(11); // 11.00 

addDecimalPlaces(111); // 111.00

Transform Numbers into currency format.

    function makeCurrency(value){
        var number = value.toString().replace(/\$|\,/g,'');
        if(isNaN(number))
            number = "0";
        isPositive = (number == (number = Math.abs(number)));
        number = Math.floor(number*100+0.50000000001);
        cents = number%100;
        number = Math.floor(number/100).toString();
        if(cents<10)
            cents = "0" + cents;
        for (var i = 0; i < Math.floor((number.length-(1+i))/3); i++)
            number = number.substring(0,number.length-(4*i+3))+','+number.substring(number.length-(4*i+3));
        return (((isPositive)?'':'-') + '$' + number + '.' + cents);

    }

One More option to consider.

    function addDecimals(number){
      return parseFloat(Math.round(number * 100) / 100).toFixed(2);
    }

Answer 6

Another Approach

  function convertToDecimal(num){

    var leftSide = num.toString().replace('.', ''),
        rightSide = '00';
    
    if(leftSide.length > 2){          
      rightSide = leftSide.slice(-2);
      leftSide = leftSide.slice(0, -2);
    }
    
    var result = Number(leftSide+'.'+rightSide).toFixed(2);        
    return (result === "NaN") ? num:result        
  }

 convertToDecimal(3) // 3.00

 convertToDecimal(32) // 32.00

 convertToDecimal(334) // 3.34

 convertToDecimal(13e+1) // 1.30

Or you can try this:

    function addDecimalPlaces(num){
        var result = num.toString();
        result = result.split('.');
        if(result[1] == undefined){
            result[1] = '00';
        }
        if(result[1].length == 1){
            result[1] = result[1]+'0';
        }
        return result[0]+'.'+result[1];
    }

addDecimalPlaces(1); // 1.00

addDecimalPlaces(11); // 11.00 

addDecimalPlaces(111); // 111.00

Transform Numbers into currency format.

    function makeCurrency(value){
        var number = value.toString().replace(/\$|\,/g,'');
        if(isNaN(number))
            number = "0";
        isPositive = (number == (number = Math.abs(number)));
        number = Math.floor(number*100+0.50000000001);
        cents = number%100;
        number = Math.floor(number/100).toString();
        if(cents<10)
            cents = "0" + cents;
        for (var i = 0; i < Math.floor((number.length-(1+i))/3); i++)
            number = number.substring(0,number.length-(4*i+3))+','+number.substring(number.length-(4*i+3));
        return (((isPositive)?'':'-') + '$' + number + '.' + cents);

    }

One More option to consider.

    function addDecimals(number){
      return parseFloat(Math.round(number * 100) / 100).toFixed(2);
    }

How to enhance precision by adding decimal places using JavaScript

Answer №1

Answer №2

observations

Answer №3

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