A format string. This is intentionally incompatible with other string types, to make it difficult to construct a format string by concatenating string fragments (a very common way to accidentally make code vulnerable to malicious data).

This type is an instance of IsString, so the easiest way to construct a query is to enable the OverloadedStrings language extension and then simply write the query in double quotes.

 {-# LANGUAGE OverloadedStrings #-}

 import Data.Text.Format

 f :: Format
 f = "hello {}"

The underlying type is Text, so literal Haskell strings that contain Unicode characters will be correctly handled.

Use this newtype wrapper for your single parameter if you are formatting a string containing exactly one substitution site.

Render a floating point number using a much faster algorithm than the default (up to 10x faster). This performance comes with a potential cost in readability, as the faster algorithm can produce strings that are longer than the default algorithm (e.g. "1.3300000000000001" instead of "1.33").

Render a value using its Show instance.

Render a format string and arguments to a Text.

Render a format string and arguments, then print the result.

Render a format string and arguments, then print the result to the given file handle.

Render a format string and arguments to a Builder.

Pad the left hand side of a string until it reaches k characters wide, if necessary filling with character c.

Pad the right hand side of a string until it reaches k characters wide, if necessary filling with character c.

Render a floating point number using normal notation, with the given number of decimal places.

Render a floating point number using scientific/engineering notation (e.g. 2.3e123).

Render an integer using hexadecimal notation. (No leading 0x is added.)

Render a floating point number using normal notation.

Render a floating point number using scientific/engineering notation (e.g. 2.3e123), with the given number of decimal places.