Cookbook : and Sorting list and arrays (#2098)

* Cookbook: add Sorting

* Update 00-stdlib.md / remove tabs

* Update 00-stdlib.md / remove tabs

---------

Co-authored-by: Frederic LOYER <[email protected]>

data/cookbook/cookbook_categories.yml

@@ -54,7 +54,9 @@ cookbook_categories:
   tasks: []
 - title: Sorting
   folder: sorting
-  tasks: []
+  tasks:
+  - title: Sorting Lists and Arrays
+    folder: sorting
 - title: Text Processing
   folder: text-processing
   tasks: []

data/cookbook/sorting/sorting/00-stdlib.md

@@ -0,0 +1,26 @@
+---
+packages: []
+sections:
+- filename: main.ml
+  language: ocaml
+  code_blocks:
+  - explanation: |
+      Sorting a list of item, returning a sorted copy.
+    code: |
+      let l = [ 1; 90; 42; 27 ];;
+        let l' = List.sort compare a
+  - explanation: |
+      Sorting an array while modifying it.
+    code: |
+      let a = [| 1; 90; 42; 27 |];;
+      let () = Array.sort compare a;;
+  - explanation: |
+      Defining a custom `compare` function (here a case insensitive string comparison) an using it to compare.
+      Note: the comparison function applied to `a` and `b` should return 1 if `a` is greater, 0, if equal, -1 if lower than `b`.
+    code: |
+      let compare_insensitive a b = 
+            compare (String.lowercase_ascii a) (String.lowercase_ascii b)
+      let a = [| "ABC"; "BCD"; "abc"; "bcd" |]
+      let () = Array.compare_insensitive a
+---
+