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wyattdanger/squareroot.coffee

Created May 22, 2012 19:05
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squareroot.coffee
squareRoot = ( num ) ->
square = ( x ) -> x * x
avg = ( x, y ) -> (x + y) / 2
goodEnough = ( x ) -> Math.abs( square( x ) - num ) < 0.01
improveGuess = ( x ) -> avg( x, num/x )
iter = ( guess ) ->
return guess if goodEnough guess
iter improveGuess guess
iter 1.0
alert squareRoot 101
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