math - JavaScript: Trim .toPrecision() trailing zeros -

i creating online calculator using javascript.

i have work out calculation:

eval(expression).toprecision(10);

this produces right output in 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 trim trailing zeros but keep nice outputs above?

only all-zero decimals

  eval('4*1').toprecision(10).replace(/\.0+$/,"")

zero ending decimals:

  eval('4.5*1').toprecision(10).replace(/\.([^0]+)0+$/,".$1")

edit: handle both 0 , ending 0 cases

edit: if use .toprecision() first, , have ".", can trim off trailing zeros:

  eval('4.5*1').toprecision(10).replace(/0+$/,"")

edit: handling trailing decimals:

eval('4.5*0').toprecision(10).replace(/\.?0+$/,"")

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