Implement every? and some

docs/language/core.rst

@@ -138,6 +138,32 @@ Return True if ``coll`` is empty, i.e. ``(= 0 (len coll))``.
    False
 
 
+.. _every?-fn:
+
+every?
+------
+
+.. versionadded:: 0.9.13
+
+Usage: ``(every? pred coll)``
+
+Return True if ``(pred x)`` is logical true for every ``x`` in ``coll``, otherwise False. Return True if ``coll`` is empty.
+
+.. code-block:: clojure
+
+   => (every? even? [2 4 6])
+   True
+
+   => (every? even? [1 3 5])
+   False
+
+   => (every? even? [2 4 5])
+   False
+
+   => (every? even? [])
+   True
+
+
 .. _float?-fn:
 
 float?
@@ -570,6 +596,32 @@ Return the second member of ``coll``. Equivalent to
    1
 
 
+.. _some-fn:
+
+some
+----
+
+.. versionadded:: 0.9.13
+
+Usage: ``(some pred coll)``
+
+Return True if ``(pred x)`` is logical true for any ``x`` in ``coll``, otherwise False. Return False if ``coll`` is empty.
+
+.. code-block:: clojure
+
+   => (some even? [2 4 6])
+   True
+
+   => (some even? [1 3 5])
+   False
+
+   => (some even? [1 3 6])
+   True
+
+   => (some even? [])
+   False
+
+
 .. _string?-fn:
 
 string?

hy/core/language.hy

@@ -108,6 +108,10 @@
   (_numeric-check n)
   (= (% n 2) 0))
 
+(defn every? [pred coll]
+  "Return true if (pred x) is logical true for every x in coll, else false"
+  (all (map pred coll)))
+
 (defn fake-source-positions [tree]
   "Fake the source positions for a given tree"
   (if (and (iterable? tree) (not (string? tree)))
@@ -294,6 +298,10 @@
   "Return second item from `coll`"
   (get coll 1))
 
+(defn some [pred coll]
+  "Return true if (pred x) is logical true for any x in coll, else false"
+  (any (map pred coll)))
+
 (defn string [x]
   "Cast x as current string implementation"
   (if-python2
@@ -338,9 +346,9 @@
   (= n 0))
 
 (def *exports* '[calling-module-name coll? cons cons? cycle dec distinct
-                 disassemble drop drop-while empty? even? first filter
+                 disassemble drop drop-while empty? even? every? first filter
                  flatten float? gensym identity inc instance? integer
                  integer? integer-char? iterable? iterate iterator?
                  list* macroexpand macroexpand-1 neg? nil? none? nth
                  numeric? odd? pos? remove repeat repeatedly rest second
-                 string string? take take-nth take-while zero?])
+                 some string string? take take-nth take-while zero?])

tests/native_tests/core.hy

@@ -123,6 +123,13 @@
   (try (even? None)
        (catch [e [TypeError]] (assert (in "not a number" (str e))))))
 
+(defn test-every? []
+  "NATIVE: testing the every? function"
+  (assert-true (every? even? [2 4 6]))
+  (assert-false (every? even? [1 3 5]))
+  (assert-false (every? even? [2 4 5]))
+  (assert-true (every? even? [])))
+
 (defn test-filter []
   "NATIVE: testing the filter function"
   (setv res (list (filter pos? [ 1 2 3 -4 5])))
@@ -399,6 +406,13 @@
   (assert-equal 2 (second [1 2]))
   (assert-equal 3 (second [2 3 4])))
 
+(defn test-some []
+  "NATIVE: testing the some function"
+  (assert-true (some even? [2 4 6]))
+  (assert-false (some even? [1 3 5]))
+  (assert-true (some even? [1 3 6]))
+  (assert-false (some even? [])))
+
 (defn test-string? []
   "NATIVE: testing string?"
   (assert-true (string? "foo"))
@@ -456,4 +470,3 @@
   (assert-equal res [None None])
   (setv res (list (take-while (fn [x] (not (none? x))) [1 2 3 4 None 5 6 None 7])))
   (assert-equal res [1 2 3 4]))
-