From 354e98325fe94f4834d360086a67d0032b83fa20 Mon Sep 17 00:00:00 2001 From: bnewbold Date: Sun, 24 Jan 2010 05:56:09 -0500 Subject: syntax fixes --- software/functional programming.page | 38 ++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 19 deletions(-) (limited to 'software/functional programming.page') diff --git a/software/functional programming.page b/software/functional programming.page index 593cf41..7fa1358 100644 --- a/software/functional programming.page +++ b/software/functional programming.page @@ -24,31 +24,31 @@ or variables in layer after layer of functions and just holding on to the outermost layer. For instance, the typical way to write a ``length`` function in python would be:: ->>> def how-long(x): ->>> l = 0 ->>> while x.has_next() ->>> l = l+1; ->>> x.pop() ->>> return l + def how-long(x): + l = 0 + while x.has_next() + l = l+1; + x.pop() + return l Using recursion, we could do:: ->>> def how-long-recurse(x): ->>> if x.has_next() ->>> x.pop() ->>> return how-long-recurse(x) + 1 ->>> else ->>> return 0 + def how-long-recurse(x): + if x.has_next() + x.pop() + return how-long-recurse(x) + 1 + else + return 0 Using the collector paradigm, we could do:: ->>> def add1(x): return a+1; ->>> def how-long-col(x, col): ->>> if x.has_next() ->>> return col(0) ->>> else ->>> x.pop() ->>> return how-long-col(x, lambda a: col(add1(a))) + def add1(x): return a+1; + def how-long-col(x, col): + if x.has_next() + return col(0) + else + x.pop() + return how-long-col(x, lambda a: col(add1(a))) The first two ways, the plus one operation is actually executed at any given time, while with the collector implementation we're really creating a -- cgit v1.2.3