fixed some lambdas after testing

1 files changed, 12 insertions, 11 deletions

diff --git a/software/functional programming.page b/software/functional programming.page
index 7fa1358..2858a99 100644
--- a/software/functional programming.page
+++ b/software/functional programming.page
@@ -24,31 +24,32 @@ 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):
+ def how_long(x):
      l = 0
-     while x.has_next()
+     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()
+ def how_long_recurse(x):
+     if x.has_next():
          x.pop()
-         return how-long-recurse(x) + 1
-     else
+         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()
+ def add1(x): return x+1;
+ def how_long_col(x, col):
+     """call this as how_long_col(<collection>, lambda b: b)"""
+     if not x.has_next():
          return col(0)
-     else
+     else:
          x.pop()
-         return how-long-col(x, lambda a: col(add1(a)))
+         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