From c94dd97cfde51a013f14eb8d9bb83aefd29413b7 Mon Sep 17 00:00:00 2001 From: jim Date: Sat, 21 Mar 2015 09:26:29 -0400 Subject: [PATCH] markup --- exercises/assignment5_answers.mdwn | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/exercises/assignment5_answers.mdwn b/exercises/assignment5_answers.mdwn index b6d2dab9..8e195ec0 100644 --- a/exercises/assignment5_answers.mdwn +++ b/exercises/assignment5_answers.mdwn @@ -165,7 +165,7 @@ Choose one of these languages and write the following functions. - If you look at the definition of `tree_walker` above, you'll see that its interface doesn't supply the `leaf_handler` function with any input like z; the `leaf_handler` only gets the content of each leaf to work on. Thus we're forced to make our `leaf_handler` return a function, that will get its `z` input later. (The strategy used here is like [[the strategy for reversing a list using fold_right in assignment2|assignment2_answers/#cps-reverse]].) Then the `joiner` function chains the results of handling the two branches together, so that when the seed `z` is supplied, we feed it first to `lh` and then the result of that to `rh`. The result of processing any tree then will be a function that expects a `z` argument. Finally, we supply the `z` argument that `tree_foldleft` was invoked with. + If you look at the definition of `tree_walker` above, you'll see that its interface doesn't supply the `leaf_handler` function with any input like `z`; the `leaf_handler` only gets the content of each leaf to work on. Thus we're forced to make our `leaf_handler` return a function, that will get its `z` input later. (The strategy used here is like [[the strategy for reversing a list using fold_right in assignment2|assignment2_answers/#cps-reverse]].) Then the `joiner` function chains the results of handling the two branches together, so that when the seed `z` is supplied, we feed it first to `lh` and then the result of that to `rh`. The result of processing any tree then will be a function that expects a `z` argument. Finally, we supply the `z` argument that `tree_foldleft` was invoked with. 5. How would you use the function defined in problem 4 (the previous problem) to sum up the values labeling the leaves of an `(int) color_tree`? -- 2.11.0