String -> ByteString -transformers

Read an entire file strictly into a ByteString. This is far more efficient than reading the characters into a String and then using pack. It also may be more efficient than opening the file and reading it using hGet. Files are read using 'binary mode' on Windows, for 'text mode' use the Char8 version of this function.

repeat :: Char -> ByteString

bytestring Data.ByteString.Lazy.Char8

repeat x is an infinite ByteString, with x the value of every element.

singleton :: Char -> ByteString

bytestring Data.ByteString.Char8, bytestring Data.ByteString.Lazy.Char8

O(1) Convert a Char into a ByteString

trace :: String -> a -> a

base Debug.Trace

When called, trace outputs the string in its first argument, before returning the second argument as its result. The trace function is not referentially transparent, and should only be used for debugging, or for monitoring execution. Some implementations of trace may decorate the string that's output to indicate that you're tracing. The function is implemented on top of putTraceMsg.

buf_fromStr :: BufferOp a -> String -> a

HTTP Network.BufferType

read :: Read a => String -> a

base Prelude, base Text.Read

The read function reads input from a string, which must be completely consumed by the input process.

strMsg :: Error a => String -> a

transformers Control.Monad.Trans.Error, mtl Control.Monad.Error.Class, mtl Control.Monad.Error

printf :: PrintfType r => String -> r

base Text.Printf

Format a variable number of arguments with the C-style formatting string. The return value is either String or (IO a). The format string consists of ordinary characters and /conversion specifications/, which specify how to format one of the arguments to printf in the output string. A conversion specification begins with the character %, followed by one or more of the following flags: > - left adjust (default is right adjust) > + always use a sign (+ or -) for signed conversions > 0 pad with zeroes rather than spaces followed optionally by a field width: > num field width > * as num, but taken from argument list followed optionally by a precision: > .num precision (number of decimal places) and finally, a format character: > c character Char, Int, Integer, ... > d decimal Char, Int, Integer, ... > o octal Char, Int, Integer, ... > x hexadecimal Char, Int, Integer, ... > X hexadecimal Char, Int, Integer, ... > u unsigned decimal Char, Int, Integer, ... > f floating point Float, Double > g general format float Float, Double > G general format float Float, Double > e exponent format float Float, Double > E exponent format float Float, Double > s string String Mismatch between the argument types and the format string will cause an exception to be thrown at runtime. Examples: > > printf "%d\n" (23::Int) > 23 > > printf "%s %s\n" "Hello" "World" > Hello World > > printf "%.2f\n" pi > 3.14

throwErrno :: String -> IO a

base Foreign.C.Error

Throw an IOError corresponding to the current value of getErrno.

throwSocketError :: String -> IO a

network Network.Socket.Internal

Throw an IOError corresponding to the current socket error.

fail :: Monad m => String -> m a

base Prelude, base Control.Monad, base Control.Monad.Instances

iterate :: (Char -> Char) -> Char -> ByteString

bytestring Data.ByteString.Lazy.Char8

iterate f x returns an infinite ByteString of repeated applications of f to x: > iterate f x == [x, f x, f (f x), ...]

replicate :: Int64 -> Char -> ByteString

bytestring Data.ByteString.Lazy.Char8

O(n) replicate n x is a ByteString of length n with x the value of every element.

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