StackOverflow2013

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PO
primarykey
Id
19647709
data
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0
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2013-10-29T00:45:11.627
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2013-10-29T01:12:02.187
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2013-10-29T01:12:02.187
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text
Body
I'm very late answering, but here's another way: <pre><code>let print_list f lst = let rec print_elements = function | [] -> () | h::t -> f h; print_string ";"; print_elements t in print_string "["; print_elements lst; print_string "]";; </code></pre> To print an int list, we could write: <pre><code>print_list print_int [3;6;78;5;2;34;7];; </code></pre> However if we were going to do this a lot, it would save time to specialize the function using partial application: <pre><code>let print_int_list = print_list print_int;; </code></pre> Which we can now use like so: <pre><code>print_int_list [3;6;78;5;2;34;7];; </code></pre> What if we wanted to do something pretty complex, like printing an int list list? With this function, it's easy: <pre><code>(* Option 1 *) print_list (print_list print_int) [[3;6;78];[];[5];[2;34;7]];; (* Option 2 *) let print_int_list_list = print_list (print_list print_int);; print_int_list_list [[3;6;78];[];[5];[2;34;7]];; (* Option 3 *) let print_int_list_list = print_list print_int_list;; print_int_list_list [[3;6;78];[];[5];[2;34;7]];; </code></pre> Printing an (int * string) list (i.e. a list of pairs of ints and strings): <pre><code>(* Option 1 *) print_list (fun (a, b) -> print_string "("; print_int a; print_string ", "; print_string b; print_string ")") [(1, "one"); (2, "two"); (3, "three")];; (* Option 2 *) let print_pair f g (a, b) = print_string "("; f a; print_string ", "; g b; print_string ")";; print_list (print_pair print_int print_string) [(1, "one"); (2, "two"); (3, "three")];; (* Option 3 *) let print_pair f g (a, b) = print_string "("; f a; print_string ", "; g b; print_string ")";; let print_int_string_pair = print_pair print_int print_string;; print_list print_int_string_pair [(1, "one"); (2, "two"); (3, "three")];; (* Option 4 *) let print_pair f g (a, b) = print_string "("; f a; print_string ", "; g b; print_string ")";; let print_int_string_pair = print_pair print_int print_string;; let print_int_string_pair_list = print_list print_int_string_pair;; print_int_string_pair_list [(1, "one"); (2, "two"); (3, "three")];; </code></pre>
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Title
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1. This table or related slice is empty.
PostParentId
1. POPrint a List in OCaml
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USBertie Wheen
UserOwnerUserId
1. USBertie Wheen
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
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1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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1. This table or related slice is empty.

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