Can javascript be trusted when making calculations?

I am implementing an invoice system, where everything is dynamically added on the dom through javascript and I am making some calculations on the browser itself with javascript. for eg I am calculating each invoice line with quantity and price of unit and generating a total sum

price can be a floating point number

but I am not sure if this should be trusted or not, if someone has the same toughts about javascript please comment :)

I don't know but javascript doesn't seem to me to be trusted like other programming languages like PHP or so, this is my opinion, but if you can convince me please do

Thanks

Solution

Javascript uses the same data type that almost all languages use for floating point calculations. The double precision floating point data type is very common, because processors have built in support for it.

Floating point numbers have a limited precision, and most numbers with a fractional part can't be represented exactly. However, for what you are going to use it for, the precision is more than enough to show a correct result.

You should just be aware of the limited precision. When displaying the result, you should make sure that it's formatted (and rounded) to the precision that you want to show. Otherwise the limited precision might show up as for example a price of 14.9500000000000001 instead 14.95.