Data.Double.Conversion.ByteString

Fast, efficient support for converting between double precision floating point values and text.

Although about 15 times faster than plain show, these functions are slower than their Text counterparts, at roughly half the speed. (This seems to be due to the cost of allocating ByteString values via malloc.)

Documentation

toExponential :: Int -> Double -> ByteString

Compute a representation in exponential format with the requested number of digits after the decimal point. The last emitted digit is rounded. If -1 digits are requested, then the shortest exponential representation is computed.

toFixed :: Int -> Double -> ByteString

Compute a decimal representation with a fixed number of digits after the decimal point. The last emitted digit is rounded.

toPrecision :: Int -> Double -> ByteString

Compute precision leading digits of the given value either in exponential or decimal format. The last computed digit is rounded.

toShortest :: Double -> ByteString

Compute the shortest string of digits that correctly represent the input number.