ap -package -fgl
In many situations, the liftM operations can be replaced by uses of ap, which promotes function application.
> return f `ap` x1 `ap` ... `ap` xn
is equivalent to
> liftMn f x1 x2 ... xn
The computation appendFile file str function appends the string str, to the file file.
Note that writeFile and appendFile write a literal string to a file. To write a value of any printable type, as with print, use the show function to convert the value to a string first.
> main = appendFile "squares" (show [(x,x*x) | x <- [0,0.1..2]])
approxRational, applied to two real fractional numbers x and epsilon, returns the simplest rational number within epsilon of x. A rational number y is said to be simpler than another y' if
* abs (numerator y) <= abs (numerator y'), and
* denominator y <= denominator y'.
Any real interval contains a unique simplest rational; in particular, note that 0/1 is the simplest rational of all.
O(n) Append two ByteStrings
O(n\c)/ Append two ByteStrings
O(n) Appends one Text to the other by copying both of them into a new Text. Subject to fusion.
O(n\c)/ Appends one Text to another. Subject to fusion.
Write a string the end of a file.
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