JavaScript: Trim .toPrecision() trailing zeros

Question

I am creating an online calculator using JavaScript.

I have this to work out a calculation:

eval(expression).toPrecision(10);

This produces the right output in almost all cases. E.g.

eval('456456+45646486*45646884').toPrecision(10)
// Output: "2.083619852e+15"

eval('1/0').toPrecision(10)
// Output: "Infinity"

However

eval('4*1').toPrecision(10)
// Output: "4.000000000"

How do I trim the trailing zeros but also keep nice outputs above?

Answer 1

Divide by 1 after using toPrecision. Javascript will trail the zeros, and there's no regexes needed.