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+### join
+
+Joins all elements of an array into a string and returns this string. Uses a separator and an end separator.
+
+Use `Array.reduce()` to combine elements into a string.
+Omit the second argument, `separator`, to use a default separator of `','`.
+Omit the third argument, `end`, to use the same value as `separator` by default.
+
+```js
+const join = (arr, separator = ',', end = separator) =>
+  arr.reduce(
+    (acc, val, i) =>
+      i == arr.length - 2
+        ? acc + val + end
+        : i == arr.length - 1 ? acc + val : acc + val + separator,
+    ''
+  );
+
+```
+
+```js
+join(); // ''
+join(['pen','pineapple','apple','pen'],',','&'); //"pen,pineapple,apple&pen"
+join(['pen','pineapple','apple','pen'],','); //"pen,pineapple,apple,pen"
+join(['pen','pineapple','apple','pen']); //"pen,pineapple,apple,pen"
+```