How to convert a number with a value of 1.10 to a lossless floating point value in JavaScript

Question

I need to convert a number with a value of 1.10 to a lossless floating point value. How can I achieve this in JavaScript.

1.10 when outputting and assigning the last 0 is lost, the result is 1.1, how to make sure that 0 is not lost when assigning in JavaScript

Isn't floating point by definition imprecise for certain values? You could convert your number to an int (`* 100`) and store that instead. — Sirko, Jul 21 '21 at 11:03
It's not clear what you're trying to do, but if it's about storing the money amount, you can go with `yourNumber.toFixed(2)`. — Robo Robok, Jul 21 '21 at 11:05
@RoboRobok I need to assign a value exactly what I got, but when assigning where 0 is present at the end, it is lost — Нурбек Тузелбек, Jul 21 '21 at 11:07
@RoboRobok I cast it to string via the toString method or use `$ {1.10}` but it also gets lost — Нурбек Тузелбек, Jul 21 '21 at 11:11
It would help if you shared your code, so we could help you in that context. — Robo Robok, Jul 21 '21 at 11:11
@RoboRobok `let num = 123123.10 console.log(`${new Number(num)}`) 123123.1 console.log(new Number(num).toString()) 123123.1` — Нурбек Тузелбек, Jul 21 '21 at 11:13
When you do `let num = 123123.10`, the trailing `0` is already lost. Numeric types don't care about the zeroes at the end, basically. — Robo Robok, Jul 21 '21 at 11:17
@RoboRobok but how can I not lose 0, it is lost even when I bring it to string — Нурбек Тузелбек, Jul 21 '21 at 11:20
Do you do any computation with this number? If you get the number as a string, then do some math with it and want the same precision back, you'd need to use `.toFixed()` on the final number, counting the precision of the original number manually. Please let me know in more detail what you're trying to do and I will post my answer when I understand your goal. — Robo Robok, Jul 21 '21 at 11:23

score 3 · Answer 1 · answered Jul 21 '21 at 11:08

3

From a number point of view, 1.10 and 1.1 are the same. The way to make this zero not to get lost is by working with strings instead of numbers, but then you lose many functionalities, like calculations.

answered Jul 21 '21 at 11:08

Marcos Sandrini

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score 2 · Answer 2 · answered Jul 21 '21 at 11:13

2

it can be done using toFixed() in javascript. for you number it can be done like this:

 console.log(1.10.toFixed(2))

answered Jul 21 '21 at 11:13

Anonymous Coder

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if you are satisfied with this answer, then please accept this as your answer, it would help me grow my profile. Thank You – Anonymous Coder Jul 21 '21 at 11:29

How to convert a number with a value of 1.10 to a lossless floating point value in JavaScript

2 Answers2