Combined is snippets into a generic one

snippets/is.md

@@ -0,0 +1,19 @@
+### is
+
+Checks if the provided value is of the specified type.
+
+Use the `instanceof` operator to check if the provided value is of the specified `type`.
+
+```js
+const is = (type, val) => val instanceof type;
+```
+
+```js
+is(Array,[1]); // true
+is(ArrayBuffer, new ArrayBuffer()); // true
+is(Map, new Map()); // true
+is(RegExp, /./g); // true
+is(Set, new Set()); // true
+is(WeakMap, new WeakMap()); // true
+is(WeakSet, new WeakSet()); // true
+```