Convert Double to String without precision loss in javascript
javascript
Solution
Let string arithmetic do the string conversion, and then use `parseFloat` to get it back to a float:
var dA = 323423.23423423e4;
var sA = dA + '';
var dnA = parseFloat(sA);
Here's a fiddle to see it in action.
Note: All JavaScript numbers are doubles, so you don't need to draw a distinction between doubles and floats. Thus, the only place you'd need to worry about precision loss is in your first line. For example, if you did `var dA = 987654321.0123456789` for your first line, it would be equivalent to `var dA = 987654321.01234567`, and `dA` would still equal `dnA` in the end.
Problem
I would like to convert a floating point variable to a string without losing any precision. I.e. I would like the string to have the same information as my floating point variable contains, since I use the output for further processing (even if it means that the string will be very long and readable). To put this more clearly, I would like to have functions for cyclic conversion ``` var dA = 323423.23423423e4; var sA = toString(dA); var dnA = toDouble(sA); ``` and I would like dnA and dA to be equal Thanks PS: Sources on the internet usually talk about how to round strings but I have not found information on exact representation. Also I am not interested in Arbitrary Precision calculations, I just need double precision floating point arithmetic.