Tech Lead/Team Lead. Senior WebDev.
Intermediate Grade on Computer Systems-
High Grade on Web Application Development-
MBA (+Marketing+HHRR).
Studied a bit of law, economics and design
Location
Spain
Education
Higher Level Education Certificate on Web Application Development
Hahaha Hi Thierry! Did you really check how much precision it has?
I mean, I stored the numbers in Strings, which is something you usually do when seeking precision -depending on the workaround- but I honestly didn't check for that. It was like, .0034 + .0066 = 0.01 -> Check!
The "bad thing" I did there is not the precision but the use of eval() as I do in the codepen. Check eval can be harmful if you are going to use it on any place.
Thank you for sharing, Decimal.js, Bigdecimal.js, Big.js and Bignumber.js, are libs that we'all should know that they exist at least, we may need them at any time 😊
Actually, i read this article few days ago and I was amazed about this issue of JS, so when I saw you calculator I just test it to know and share to you and your readers these libs ;)
Tech Lead/Team Lead. Senior WebDev.
Intermediate Grade on Computer Systems-
High Grade on Web Application Development-
MBA (+Marketing+HHRR).
Studied a bit of law, economics and design
Location
Spain
Education
Higher Level Education Certificate on Web Application Development
Hahaha I'ts ok. Just remember that is not a "Javascript issue" but an issue of the binary base we have most of the time.
In most programming languages, floating point numbers are represented a lot like scientific notation: with an exponent and a mantissa or significand.
A very simple number, say 9.2, is actually this fraction: 5179139571476070 * 2-49
Where the exponent is -49 and the mantissa or significand is 5179139571476070.
The reason it is impossible to represent some decimal numbers this way is that both the exponent and the mantissa must be integers. In other words, all floats must be an integer multiplied by an integer power of 2.
9.2 may be simply 92/10, but 10 cannot be expressed as 2n if n is limited to integer values (23=8 and 24=16).
This is information gathered from a pair of comments in SO with some annotations added in a vague try to make it more understandable, because honestly I don't feel myself skilled enough on this mathematical topics to explain it by my own without spending days in previous research and doing diagrams, examples and so.
You should check out this article dev.to/nicozerpa/javascript-has-a-...
To fix operations with decimals ;)
Hahaha Hi Thierry! Did you really check how much precision it has?
I mean, I stored the numbers in Strings, which is something you usually do when seeking precision -depending on the workaround- but I honestly didn't check for that. It was like, .0034 + .0066 = 0.01 -> Check!
The "bad thing" I did there is not the precision but the use of eval() as I do in the codepen. Check eval can be harmful if you are going to use it on any place.
Thank you for sharing, Decimal.js, Bigdecimal.js, Big.js and Bignumber.js, are libs that we'all should know that they exist at least, we may need them at any time 😊
Actually, i read this article few days ago and I was amazed about this issue of JS, so when I saw you calculator I just test it to know and share to you and your readers these libs ;)
Hahaha I'ts ok. Just remember that is not a "Javascript issue" but an issue of the binary base we have most of the time.
In most programming languages, floating point numbers are represented a lot like scientific notation: with an exponent and a mantissa or significand.
A very simple number, say 9.2, is actually this fraction:
5179139571476070 * 2-49Where the exponent is -49 and the mantissa or significand is 5179139571476070.
The reason it is impossible to represent some decimal numbers this way is that both the exponent and the mantissa must be integers. In other words, all floats must be an integer multiplied by an integer power of 2.
9.2 may be simply 92/10, but 10 cannot be expressed as 2n if n is limited to integer values (23=8 and 24=16).
This is information gathered from a pair of comments in SO with some annotations added in a vague try to make it more understandable, because honestly I don't feel myself skilled enough on this mathematical topics to explain it by my own without spending days in previous research and doing diagrams, examples and so.
You can check the original comments here.