comma package:formatn

comma :: Maybe Int -> Double -> Text

Format with US-style commas

>>> comma (Just 3) 1234567
"1,230,000"

Format using comma separators for numbers above 1,000 but below 1 million, otherwise use prec style.

>>> commaPrec (Just 3) 1234
"1,230"

>>> commaPrec (Just 3) 1234567
"1.23e6"

CommaStyle above a thousand but below a million, DecimalStyle between 0.001 and a thousand and ExponentStyle outside this range.

comma format for a SigFig

1,000 1 0.001