diff --git a/Dict.ark b/Dict.ark
index 1acebb7..7ced589 100644
--- a/Dict.ark
+++ b/Dict.ark
@@ -22,6 +22,27 @@
 # @author https://github.com/SuperFola
 (let add (fun (_D _key _value) (builtin__dict:add _D _key _value)))
 
+# @brief Checks if the dictionary has a given key
+# @param _D dictionary
+# =begin
+# (let data (dict "key" "value"))
+# (print (dict:contains? data "key"))  # true
+# (print (dict:contains? data "test"))  # false
+# =end
+# @author https://github.com/SuperFola
+(let contains? (fun (_D _key) (builtin__dict:contains _D _key)))
+
+# @brief Checks if the dictionary has a given key
+# @details **Deprecated, use `contains?`**
+# @param _D dictionary
+# =begin
+# (let data (dict "key" "value"))
+# (print (dict:contains data "key"))  # true
+# (print (dict:contains data "test"))  # false
+# =end
+# @author https://github.com/SuperFola
+(let contains contains?)
+
 # @brief Get a value from a given dictionary using a key, or a default value if it doesn't exist
 # @param _D dictionary
 # @param _key key to get
@@ -53,16 +74,6 @@
     (add _D _key (_f (get _D _key)))
     (add _D _key _default))))
 
-# @brief Checks if the dictionary has a given key
-# @param _D dictionary
-# =begin
-# (let data (dict "key" "value"))
-# (print (dict:contains data "key"))  # true
-# (print (dict:contains data "test"))  # false
-# =end
-# @author https://github.com/SuperFola
-(let contains (fun (_D _key) (builtin__dict:contains _D _key)))
-
 # @brief Deletes an entry from a dictionary, given a key
 # @details The dictionary is modified in place
 # @param _D dictionary
diff --git a/List.ark b/List.ark
index dd0d9b1..c5a8afd 100644
--- a/List.ark
+++ b/List.ark
@@ -223,7 +223,7 @@
 # @details The original list is not modified.
 # =begin
 # (import std.Math)
-# (print (list:filter [1 2 3 4 5 6 7 8 9] math:even))  # [2 4 6 8]
+# (print (list:filter [1 2 3 4 5 6 7 8 9] math:even?))  # [2 4 6 8]
 # =end
 # @author https://github.com/rstefanic
 (let filter (fun (_L _f) {
diff --git a/Math.ark b/Math.ark
index 337c08e..d2058a6 100644
--- a/Math.ark
+++ b/Math.ark
@@ -169,12 +169,24 @@
 # @brief Return true if the number is even, false otherwise
 # @param _n the number
 # @author https://github.com/rstefanic
-(let even (fun (_n) (= 0 (mod _n 2))))
+(let even? (fun (_n) (= 0 (mod _n 2))))
+
+# @brief Return true if the number is even, false otherwise
+# @details **Deprecated, use `even?`**
+# @param _n the number
+# @author https://github.com/rstefanic
+(let even even?)
+
+# @brief Return true if the number is odd, false otherwise
+# @param _n the number
+# @author https://github.com/rstefanic
+(let odd? (fun (_n) (= 1 (abs (mod _n 2)))))
 
 # @brief Return true if the number is odd, false otherwise
+# @details **Deprecated, use `odd?`**
 # @param _n the number
 # @author https://github.com/rstefanic
-(let odd (fun (_n) (= 1 (abs (mod _n 2)))))
+(let odd odd?)
 
 # @brief Get the minimum between two numbers
 # @param _a the first number
diff --git a/Range.ark b/Range.ark
index 5e2cc0b..0a6b146 100644
--- a/Range.ark
+++ b/Range.ark
@@ -61,7 +61,7 @@
 # =begin
 # (import std.Math)
 # (let obj (range:range 1 10))
-# (print (range:filter obj math:even))  # [2 4 6 8]
+# (print (range:filter obj math:even?))  # [2 4 6 8]
 # =end
 # @author https://github.com/SuperFola
 (let filter (fun (_range _fun) {
diff --git a/String.ark b/String.ark
index 54896fe..6e30120 100644
--- a/String.ark
+++ b/String.ark
@@ -100,6 +100,31 @@
 # @author https://github.com/SuperFola
 (let setAt (fun (_str _index _x) (builtin__string:setAt _str _index _x)))
 
+# @brief Check if a string contains a word
+# @param _str String where the lookup occurs
+# @param _word Word to look up for
+# @author https://github.com/SuperFola
+(let contains? (fun (_str _word)
+  (!= -1 (find _str _word))))
+
+# @brief Check if a string contains a word for a set of words
+# @param _str String where the lookup occurs
+# @param _set_of_words Words to look for
+# =begin
+# (let words ["hello" "world"])
+# (print (containsAnyOf "Hello, world! I like almonds" words))  # true
+# (print (containsAnyOf "Hello, world!" string:punctuation))  # true
+# =end
+# @author https://github.com/SuperFola
+(let containsAnyOf? (fun (_str _set_of_words) {
+  (mut _contains false)
+  (mut _i 0)
+  (while (and (not _contains) (< _i (len _set_of_words))) {
+    (if (!= -1 (find _str (@ _set_of_words _i)))
+      (set _contains true))
+    (set _i (+ 1 _i)) })
+  _contains }))
+
 # @brief Check if a string is empty or only consists of whitespaces
 # @param _str the string to check
 # =begin
@@ -254,7 +279,7 @@
 # @details Returns a list of strings. Example :
 # =begin
 # (let message "hello world, I like boats")
-# (let splitted (string:split message " "))
+# (let as-list (string:split message " "))
 # =end
 # @author https://github.com/Natendrtfm
 (let split (fun (_string _separator) {
diff --git a/Testing.ark b/Testing.ark
index f4aef5f..ef06abc 100644
--- a/Testing.ark
+++ b/Testing.ark
@@ -203,8 +203,8 @@
     (testing:_report_success)) })
 
 # @brief Compare two values that should be equal and generate a test case
-# @param _expected expected value
 # @param _expr computed value to test
+# @param _expected expected value
 # @param _desc an optional description (string) for the test
 # =begin
 # (test:suite name {
@@ -212,21 +212,21 @@
 #     (test:eq 5 (foo) "foo should return 5")})
 # =end
 # @author https://github.com/SuperFola
-(macro test:eq (_expected _expr ..._desc) {
+(macro test:eq (_expr _expected ..._desc) {
   (if (= ($as-is _expected) ($as-is _expr))
     (testing:_report_success)
     (testing:_report_error ($as-is _expected) ($as-is _expr) ($repr _expected) ($repr _expr) _desc)) })
 
 # @brief Compare two values that should **not** be equal and generate a test case
-# @param _unexpected the value we don't want
 # @param _value tested value
+# @param _unexpected the value we don't want
 # @param _desc an optional description (string) for the test
 # =begin
 # (test:suite name {
 #     (test:neq 0 (my_function 1 2 3))})
 # =end
 # @author https://github.com/SuperFola
-(macro test:neq (_unexpected _value ..._desc) {
+(macro test:neq (_value _unexpected ..._desc) {
   (if (!= ($as-is _unexpected) ($as-is _value))
     (testing:_report_success)
     (testing:_report_error ($as-is _unexpected) ($as-is _value) ($repr _unexpected) ($repr _value) _desc)) })
diff --git a/tests/dict-tests.ark b/tests/dict-tests.ark
index 8129543..67ef81f 100644
--- a/tests/dict-tests.ark
+++ b/tests/dict-tests.ark
@@ -50,15 +50,15 @@
         (test:eq (dict:getOrElse empty "key" 0) 0) })
 
     (test:case "contains" {
-        (test:expect (dict:contains d "key"))
-        (test:expect (dict:contains d 5))
-        (test:expect (dict:contains d true))
-        (test:expect (dict:contains d false))
-        (test:expect (dict:contains d foo))
-        (test:expect (dict:contains d closure))
-        (test:expect (not (dict:contains d -1)))
-        (test:expect (not (dict:contains d "hello")))
-        (test:expect (not (dict:contains d d))) })
+        (test:expect (dict:contains? d "key"))
+        (test:expect (dict:contains? d 5))
+        (test:expect (dict:contains? d true))
+        (test:expect (dict:contains? d false))
+        (test:expect (dict:contains? d foo))
+        (test:expect (dict:contains? d closure))
+        (test:expect (not (dict:contains? d -1)))
+        (test:expect (not (dict:contains? d "hello")))
+        (test:expect (not (dict:contains? d d))) })
 
     (test:case "size" {
         (test:eq (dict:size d) 6)
@@ -153,9 +153,9 @@
     (test:case "filter!" {
         (dict:filter! d2 filter_odd)
         (test:eq (dict:size d2) 2)
-        (test:expect (dict:contains d2 "a"))
-        (test:expect (not (dict:contains d2 "b")))
-        (test:expect (dict:contains d2 "c"))
+        (test:expect (dict:contains? d2 "a"))
+        (test:expect (not (dict:contains? d2 "b")))
+        (test:expect (dict:contains? d2 "c"))
         (test:eq (dict:get d2 "a") 1)
         (test:eq (dict:get d2 "c") 3)
 
diff --git a/tests/list-tests.ark b/tests/list-tests.ark
index 3565be7..c0b12ce 100644
--- a/tests/list-tests.ark
+++ b/tests/list-tests.ark
@@ -1,5 +1,5 @@
 (import std.List)
-(import std.Math :even)
+(import std.Math :even?)
 (import std.Testing)
 
 (let a [1 2 3])
@@ -69,7 +69,7 @@
         (test:eq (list:dropWhile a (fun (c) (< c 5))) []) })
 
     (test:case "filter" {
-        (test:eq (list:filter a math:even) [2])
+        (test:eq (list:filter a math:even?) [2])
         (test:eq (list:filter a (fun (e) (> e 100))) [])
         (test:eq (list:filter [] (fun (e) (> e 100))) []) })
 
diff --git a/tests/math-tests.ark b/tests/math-tests.ark
index c822e75..3271bbc 100644
--- a/tests/math-tests.ark
+++ b/tests/math-tests.ark
@@ -33,10 +33,10 @@
 
     (test:eq (math:abs -1) 1)
     (test:eq (math:abs 1) 1)
-    (test:expect (math:even 2))
-    (test:expect (math:even -2))
-    (test:expect (math:odd 1))
-    (test:expect (math:odd -1))
+    (test:expect (math:even? 2))
+    (test:expect (math:even? -2))
+    (test:expect (math:odd? 1))
+    (test:expect (math:odd? -1))
     (test:eq (math:min 1 2) 1)
     (test:eq (math:min 1 -2) -2)
     (test:eq (math:min 0.5 0.2) 0.2)
diff --git a/tests/range-tests.ark b/tests/range-tests.ark
index b570274..0267d9d 100644
--- a/tests/range-tests.ark
+++ b/tests/range-tests.ark
@@ -1,5 +1,5 @@
 (import std.Range:*)
-(import std.Math :even)
+(import std.Math :even?)
 (import std.Testing)
 
 (test:suite range {
@@ -17,7 +17,7 @@
     (range:forEach r (fun (e)
         (test:neq e nil)))
 
-    (let filtered (range:filter r math:even))
+    (let filtered (range:filter r math:even?))
     (test:eq filtered [0 2 4 6 8])
 
     (let mapped (range:map r (fun (e) (* e e))))
diff --git a/tests/string-tests.ark b/tests/string-tests.ark
index a02b899..cbc3bfc 100644
--- a/tests/string-tests.ark
+++ b/tests/string-tests.ark
@@ -9,6 +9,17 @@
     (test:eq (builtin__string:removeAt "abcd" 1) (string:removeAt "abcd" 1))
     (test:eq (builtin__string:setAt "abcd" 1 "z") (string:setAt "abcd" 1 "z"))
 
+    (test:expect (string:contains? "hello, world" "h"))
+    (test:expect (string:contains? "hello, world" "hello"))
+    (test:expect (string:contains? "hello, world" "world"))
+    (test:expect (string:contains? "hello, world" ","))
+    (test:expect (not (string:contains? "hello, world" "!")))
+
+    (test:expect (string:containsAnyOf? "Hello, world" ["world" "one"]))
+    (test:expect (string:containsAnyOf? "Hello, world" string:punctuation))
+    (test:expect (not (string:containsAnyOf? "Hello, world" [])))
+    (test:expect (not (string:containsAnyOf? "Hello, world" ["nice" "cool"])))
+
     (test:eq (string:emptyOrWhitespace? "") true)
     (test:eq (string:emptyOrWhitespace? " ") true)
     (test:eq (string:emptyOrWhitespace? "   ") true)