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How to add values in javascript when converting from string

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0

I have a string that I try to convert to a decimal number with 16 decimals. Then I like to add that number to the number 0 which should be:

30280.9529335

But I get: 030280.9529335

How do you properly do this in javascript?

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x).toFixed(16);

javascript double decimal

share|improve this question

edited Mar 24 at 16:42

Code Maniac

15.1k21035

asked Mar 24 at 15:19

AndreasAndreas

1881111

add a comment | 

0

I have a string that I try to convert to a decimal number with 16 decimals. Then I like to add that number to the number 0 which should be:

30280.9529335

But I get: 030280.9529335

How do you properly do this in javascript?

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x).toFixed(16);

javascript double decimal

share|improve this question

edited Mar 24 at 16:42

Code Maniac

15.1k21035

asked Mar 24 at 15:19

AndreasAndreas

1881111

add a comment | 

I have a string that I try to convert to a decimal number with 16 decimals. Then I like to add that number to the number 0 which should be:

30280.9529335

But I get: 030280.9529335

How do you properly do this in javascript?

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x).toFixed(16);

javascript double decimal

share|improve this question

edited Mar 24 at 16:42

Code Maniac

15.1k21035

asked Mar 24 at 15:19

AndreasAndreas

1881111

30280.9529335

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x).toFixed(16);

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x).toFixed(16);

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x).toFixed(16);

share|improve this question

edited Mar 24 at 16:42

Code Maniac

15.1k21035

asked Mar 24 at 15:19

AndreasAndreas

1881111

share|improve this question

edited Mar 24 at 16:42

Code Maniac

15.1k21035

asked Mar 24 at 15:19

AndreasAndreas

1881111

edited Mar 24 at 16:42

Code Maniac

15.1k21035

edited Mar 24 at 16:42

Code Maniac

15.1k21035

asked Mar 24 at 15:19

AndreasAndreas

1881111

asked Mar 24 at 15:19

AndreasAndreas

1881111

2 Answers
2

active

oldest

votes

1

Well your problem is placement of toFixed, toFixed return String not number

console.log(typeof (1).toFixed(2))

So here your ConvertToDouble function returns string and 0 + some numeric string will act as concatenation not addition

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber.toFixed(16)); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x)

share|improve this answer

answered Mar 24 at 15:35

Code ManiacCode Maniac

15.1k21035

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It worked but I wonder: If I remove ".toFixed(16)", does it still use 16 decimals when calculating or is it Float with only 7 decimals?
  
  – Andreas
  Mar 24 at 15:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Andreas it will use only 7 decimals as it was doing previously.
  
  – Code Maniac
  Mar 24 at 15:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Code Maniac I see, so it is not possible to caluculate with 16 decimals at all in javascript/node.js?
  
  – Andreas
  Mar 24 at 15:45
  
  

  
  
  
  

add a comment | 

0

You can use Number.parseFloat and Number.parseInt similar to how you were. You used toFixed incorrectly.

The toFixed() method converts a number into a string, keeping a specified number of decimals. If the desired number of decimals are higher than the actual number, nulls are added to create the desired decimal length.

Example:

let a = "30280.9529335";
console.log(parseFloat(a))
// 30280.9529335

let totalnumber = 0;
let str = "30280.9529335";

function convert(a, b) 
 try 
 return (Number.parseInt(a) + Number.parseFloat(b)).toFixed(16)
 catch(error) 
 return error;
 


function convertb(a, b) 
 try 
 return Number.parseInt(a) + Number.parseFloat(b)
 catch(error) 
 return error;
 


 console.log(convert(totalnumber, str))
 console.log(convertb(totalnumber, str))

You can also use bigInts https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt

const theBiggestInt = 9007199254740991n;
const alsoHuge = BigInt(9007199254740991);
// ↪ 9007199254740991n
const hugeString = BigInt("9007199254740991");
// ↪ 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff");
// ↪ 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111");
// ↪ 9007199254740991n

share|improve this answer

edited Mar 24 at 15:49

answered Mar 24 at 15:27

RaymondRaymond

1,115415

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I was not sure about the .toFixed(16), I thought it returned a decimal number with 16 places. So it was a string. That makes sense to the concatenation that happened.
  
  – Andreas
  Mar 24 at 15:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help. It was helpful!
  
  – Andreas
  Mar 24 at 15:59
  

  
  
  
  

add a comment | 

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1

Well your problem is placement of toFixed, toFixed return String not number

console.log(typeof (1).toFixed(2))

So here your ConvertToDouble function returns string and 0 + some numeric string will act as concatenation not addition

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber.toFixed(16)); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x)

share|improve this answer

answered Mar 24 at 15:35

Code ManiacCode Maniac

15.1k21035

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It worked but I wonder: If I remove ".toFixed(16)", does it still use 16 decimals when calculating or is it Float with only 7 decimals?
  
  – Andreas
  Mar 24 at 15:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Andreas it will use only 7 decimals as it was doing previously.
  
  – Code Maniac
  Mar 24 at 15:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Code Maniac I see, so it is not possible to caluculate with 16 decimals at all in javascript/node.js?
  
  – Andreas
  Mar 24 at 15:45
  
  

  
  
  
  

add a comment | 

1

Well your problem is placement of toFixed, toFixed return String not number

console.log(typeof (1).toFixed(2))

So here your ConvertToDouble function returns string and 0 + some numeric string will act as concatenation not addition

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber.toFixed(16)); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x)

share|improve this answer

answered Mar 24 at 15:35

Code ManiacCode Maniac

15.1k21035

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It worked but I wonder: If I remove ".toFixed(16)", does it still use 16 decimals when calculating or is it Float with only 7 decimals?
  
  – Andreas
  Mar 24 at 15:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Andreas it will use only 7 decimals as it was doing previously.
  
  – Code Maniac
  Mar 24 at 15:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Code Maniac I see, so it is not possible to caluculate with 16 decimals at all in javascript/node.js?
  
  – Andreas
  Mar 24 at 15:45
  
  

  
  
  
  

add a comment | 

Well your problem is placement of toFixed, toFixed return String not number

console.log(typeof (1).toFixed(2))

So here your ConvertToDouble function returns string and 0 + some numeric string will act as concatenation not addition

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber.toFixed(16)); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x)

share|improve this answer

answered Mar 24 at 15:35

Code ManiacCode Maniac

15.1k21035

console.log(typeof (1).toFixed(2))

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber.toFixed(16)); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x)

console.log(typeof (1).toFixed(2))

console.log(typeof (1).toFixed(2))

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber.toFixed(16)); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x)

var totalnumber = 0; var str = "30280.9529335";
totalnumber = totalnumber + ConvertToDouble(str);

console.log(totalnumber.toFixed(16)); //030280.9529335

function ConvertToDouble(x) 
 return Number.parseFloat(x)

share|improve this answer

answered Mar 24 at 15:35

Code ManiacCode Maniac

15.1k21035

answered Mar 24 at 15:35

Code ManiacCode Maniac

15.1k21035

answered Mar 24 at 15:35

Code ManiacCode Maniac

15.1k21035

0

You can use Number.parseFloat and Number.parseInt similar to how you were. You used toFixed incorrectly.

The toFixed() method converts a number into a string, keeping a specified number of decimals. If the desired number of decimals are higher than the actual number, nulls are added to create the desired decimal length.

Example:

let a = "30280.9529335";
console.log(parseFloat(a))
// 30280.9529335

let totalnumber = 0;
let str = "30280.9529335";

function convert(a, b) 
 try 
 return (Number.parseInt(a) + Number.parseFloat(b)).toFixed(16)
 catch(error) 
 return error;
 


function convertb(a, b) 
 try 
 return Number.parseInt(a) + Number.parseFloat(b)
 catch(error) 
 return error;
 


 console.log(convert(totalnumber, str))
 console.log(convertb(totalnumber, str))

You can also use bigInts https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt

const theBiggestInt = 9007199254740991n;
const alsoHuge = BigInt(9007199254740991);
// ↪ 9007199254740991n
const hugeString = BigInt("9007199254740991");
// ↪ 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff");
// ↪ 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111");
// ↪ 9007199254740991n

share|improve this answer

edited Mar 24 at 15:49

answered Mar 24 at 15:27

RaymondRaymond

1,115415

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I was not sure about the .toFixed(16), I thought it returned a decimal number with 16 places. So it was a string. That makes sense to the concatenation that happened.
  
  – Andreas
  Mar 24 at 15:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help. It was helpful!
  
  – Andreas
  Mar 24 at 15:59
  

  
  
  
  

add a comment | 

0

You can use Number.parseFloat and Number.parseInt similar to how you were. You used toFixed incorrectly.

The toFixed() method converts a number into a string, keeping a specified number of decimals. If the desired number of decimals are higher than the actual number, nulls are added to create the desired decimal length.

Example:

let a = "30280.9529335";
console.log(parseFloat(a))
// 30280.9529335

let totalnumber = 0;
let str = "30280.9529335";

function convert(a, b) 
 try 
 return (Number.parseInt(a) + Number.parseFloat(b)).toFixed(16)
 catch(error) 
 return error;
 


function convertb(a, b) 
 try 
 return Number.parseInt(a) + Number.parseFloat(b)
 catch(error) 
 return error;
 


 console.log(convert(totalnumber, str))
 console.log(convertb(totalnumber, str))

You can also use bigInts https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt

const theBiggestInt = 9007199254740991n;
const alsoHuge = BigInt(9007199254740991);
// ↪ 9007199254740991n
const hugeString = BigInt("9007199254740991");
// ↪ 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff");
// ↪ 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111");
// ↪ 9007199254740991n

share|improve this answer

edited Mar 24 at 15:49

answered Mar 24 at 15:27

RaymondRaymond

1,115415

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I was not sure about the .toFixed(16), I thought it returned a decimal number with 16 places. So it was a string. That makes sense to the concatenation that happened.
  
  – Andreas
  Mar 24 at 15:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help. It was helpful!
  
  – Andreas
  Mar 24 at 15:59
  

  
  
  
  

add a comment | 

You can use Number.parseFloat and Number.parseInt similar to how you were. You used toFixed incorrectly.

The toFixed() method converts a number into a string, keeping a specified number of decimals. If the desired number of decimals are higher than the actual number, nulls are added to create the desired decimal length.

Example:

let a = "30280.9529335";
console.log(parseFloat(a))
// 30280.9529335

let totalnumber = 0;
let str = "30280.9529335";

function convert(a, b) 
 try 
 return (Number.parseInt(a) + Number.parseFloat(b)).toFixed(16)
 catch(error) 
 return error;
 


function convertb(a, b) 
 try 
 return Number.parseInt(a) + Number.parseFloat(b)
 catch(error) 
 return error;
 


 console.log(convert(totalnumber, str))
 console.log(convertb(totalnumber, str))

You can also use bigInts https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt

const theBiggestInt = 9007199254740991n;
const alsoHuge = BigInt(9007199254740991);
// ↪ 9007199254740991n
const hugeString = BigInt("9007199254740991");
// ↪ 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff");
// ↪ 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111");
// ↪ 9007199254740991n

share|improve this answer

edited Mar 24 at 15:49

answered Mar 24 at 15:27

RaymondRaymond

1,115415

let a = "30280.9529335";
console.log(parseFloat(a))
// 30280.9529335

let totalnumber = 0;
let str = "30280.9529335";

function convert(a, b) 
 try 
 return (Number.parseInt(a) + Number.parseFloat(b)).toFixed(16)
 catch(error) 
 return error;
 


function convertb(a, b) 
 try 
 return Number.parseInt(a) + Number.parseFloat(b)
 catch(error) 
 return error;
 


 console.log(convert(totalnumber, str))
 console.log(convertb(totalnumber, str))

const theBiggestInt = 9007199254740991n;
const alsoHuge = BigInt(9007199254740991);
// ↪ 9007199254740991n
const hugeString = BigInt("9007199254740991");
// ↪ 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff");
// ↪ 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111");
// ↪ 9007199254740991n

let totalnumber = 0;
let str = "30280.9529335";

function convert(a, b) 
 try 
 return (Number.parseInt(a) + Number.parseFloat(b)).toFixed(16)
 catch(error) 
 return error;
 


function convertb(a, b) 
 try 
 return Number.parseInt(a) + Number.parseFloat(b)
 catch(error) 
 return error;
 


 console.log(convert(totalnumber, str))
 console.log(convertb(totalnumber, str))

let totalnumber = 0;
let str = "30280.9529335";

function convert(a, b) 
 try 
 return (Number.parseInt(a) + Number.parseFloat(b)).toFixed(16)
 catch(error) 
 return error;
 


function convertb(a, b) 
 try 
 return Number.parseInt(a) + Number.parseFloat(b)
 catch(error) 
 return error;
 


 console.log(convert(totalnumber, str))
 console.log(convertb(totalnumber, str))

const theBiggestInt = 9007199254740991n;
const alsoHuge = BigInt(9007199254740991);
// ↪ 9007199254740991n
const hugeString = BigInt("9007199254740991");
// ↪ 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff");
// ↪ 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111");
// ↪ 9007199254740991n

const theBiggestInt = 9007199254740991n;
const alsoHuge = BigInt(9007199254740991);
// ↪ 9007199254740991n
const hugeString = BigInt("9007199254740991");
// ↪ 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff");
// ↪ 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111");
// ↪ 9007199254740991n

share|improve this answer

edited Mar 24 at 15:49

answered Mar 24 at 15:27

RaymondRaymond

1,115415

answered Mar 24 at 15:27

RaymondRaymond

1,115415

answered Mar 24 at 15:27

RaymondRaymond

1,115415