const package:xmonad-contrib

const x y always evaluates to x, ignoring its second argument.

const x = \_ -> x

This function might seem useless at first glance, but it can be very useful in a higher order context.

Examples

>>> const 42 "hello"
42

>>> map (const 42) [0..3]
[42,42,42,42]

Lets you constrain the aspect ratio of a floating window (by, say, holding shift while you resize). Useful for making a nice circular XClock window.

Log the given string, as is.