Created
October 5, 2013 18:46
-
-
Save akimboyko/6844680 to your computer and use it in GitHub Desktop.
Functional Programming Principles in Scala week #02
Confusing sample with λ expression
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| def isCloseEnough(x : Double, y : Double) = { | |
| val tolerance = 0.0001 | |
| Math.abs((x - y) / x) < tolerance | |
| } | |
| def fixedPoint(f : Double => Double)(firstGuess : Double) = { | |
| def iterate(guess : Double) : Double = { | |
| val next = f(guess) | |
| if(isCloseEnough(guess, next)) next | |
| else iterate((next + guess) / 2) | |
| } | |
| iterate(firstGuess) | |
| } | |
| def sqrt(x : Double) = fixedPoint(y => x / y)(1) | |
| sqrt(2) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment