diff --git a/snippets/xProd.md b/snippets/xProd.md
index 332d9f76e..d5ff74b61 100644
--- a/snippets/xProd.md
+++ b/snippets/xProd.md
@@ -2,10 +2,10 @@
 
 Creates a new array out of the two supplied by creating each possible pair from the arrays.
 
-Use `Array.map()` to produce every possible pair from the elements of the two arrays.
+Use `Array.reduce()`, `Array.map()` and `Array.concat()` to produce every possible pair from the elements of the two arrays and save them in an array.
 
 ```js
-const xProd = (a, b) => a.map(x => b.map(y => [x, y]));
+const xProd = (a, b) => a.reduce((acc,x) => acc.concat(b.map(y => [x, y])),[]);
 ```
 
 ```js
diff --git a/test/is/is.test.js b/test/is/is.test.js
index 78d7b1e3a..922cc0f8c 100644
--- a/test/is/is.test.js
+++ b/test/is/is.test.js
@@ -5,9 +5,25 @@ test('Testing is', (t) => {
 	//For more information on all the methods supported by tape
 	//Please go to https://github.com/substack/tape
 	t.true(typeof is === 'function', 'is is a Function');
+  t.true(is(Array, [1]), `Works for arrays with data`);
+  t.true(is(Array, []), `Works for empty arrays`);
+  t.false(is(Array, {}), `Works for arrays, not objects`);
+  t.true(is(Object, {}), `Works for objects`);
+  t.true(is(Map, new Map()), `Works for maps`);
+  t.true(is(RegExp, /./g), `Works for regular expressions`);
+  t.true(is(Set, new Set()), `Works for sets`);
+  t.true(is(WeakMap, new WeakMap()), `Works for weak maps`);
+  t.true(is(WeakSet, new WeakSet()), `Works for weak sets`);
+  t.false(is(String, ''), `Works for strings - returns false for primitive`);
+  t.true(is(String, new String('')), `Works for strings - returns true when using constructor`);
+  t.false(is(Number, 1), `Works for numbers - returns false for primitive`);
+  t.true(is(Number, new Number('10')), `Works for numbers - returns true when using constructor`);
+  t.false(is(Boolean, false), `Works for booleans - returns false for primitive`);
+  t.true(is(Boolean, new Boolean(false)), `Works for booleans - returns true when using constructor`);
+  t.true(is(Function, () => null), `Works for functions`);
 	//t.deepEqual(is(args..), 'Expected');
 	//t.equal(is(args..), 'Expected');
 	//t.false(is(args..), 'Expected');
 	//t.throws(is(args..), 'Expected');
 	t.end();
-});
\ No newline at end of file
+});
diff --git a/test/testlog b/test/testlog
index ec65e3ba3..051197040 100644
--- a/test/testlog
+++ b/test/testlog
@@ -1,4 +1,4 @@
-Test log for: Wed Jan 24 2018 16:47:50 GMT+0200 (GTB Standard Time)
+Test log for: Wed Jan 24 2018 17:16:12 GMT+0200 (GTB Standard Time)
 
 > 30-seconds-of-code@0.0.1 test G:\My Files\git Repositories\30-seconds-of-code
 > tape test/**/*.test.js | tap-spec
@@ -555,6 +555,22 @@ Test log for: Wed Jan 24 2018 16:47:50 GMT+0200 (GTB Standard Time)
   Testing is
 
     √ is is a Function
+    √ Works for arrays with data
+    √ Works for empty arrays
+    √ Works for arrays, not objects
+    √ Works for objects
+    √ Works for maps
+    √ Works for regular expressions
+    √ Works for sets
+    √ Works for weak maps
+    √ Works for weak sets
+    √ Works for strings - returns false for primitive
+    √ Works for strings - returns true when using constructor
+    √ Works for numbers - returns false for primitive
+    √ Works for numbers - returns true when using constructor
+    √ Works for booleans - returns false for primitive
+    √ Works for booleans - returns true when using constructor
+    √ Works for functions
 
   Testing isAbsoluteURL
 
@@ -1323,10 +1339,13 @@ Test log for: Wed Jan 24 2018 16:47:50 GMT+0200 (GTB Standard Time)
   Testing unzip
 
     √ unzip is a Function
+    √ unzip([['a', 1, true], ['b', 2, false]]) equals [['a', 'b'], [1, 2], [true, false]]
+    √ unzip([['a', 1, true], ['b', 2]]) equals [['a', 'b'], [1, 2], [true]]
 
   Testing unzipWith
 
     √ unzipWith is a Function
+    √ unzipWith([[1, 10, 100], [2, 20, 200]], (...args) => args.reduce((acc, v) => acc + v, 0)) equals [3, 30, 300]
 
   Testing URLJoin
 
@@ -1387,6 +1406,7 @@ Test log for: Wed Jan 24 2018 16:47:50 GMT+0200 (GTB Standard Time)
   Testing xProd
 
     √ xProd is a Function
+    √ xProd([1, 2], ['a', 'b']) returns [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]
 
   Testing yesNo
 
@@ -1434,8 +1454,8 @@ Test log for: Wed Jan 24 2018 16:47:50 GMT+0200 (GTB Standard Time)
     √ zipWith is a Function
 
 
-  total:     598
-  passing:   598
-  duration:  1.3s
+  total:     618
+  passing:   618
+  duration:  412ms
 
 
diff --git a/test/unzip/unzip.test.js b/test/unzip/unzip.test.js
index 17efbc0a4..76be27786 100644
--- a/test/unzip/unzip.test.js
+++ b/test/unzip/unzip.test.js
@@ -5,9 +5,11 @@ test('Testing unzip', (t) => {
 	//For more information on all the methods supported by tape
 	//Please go to https://github.com/substack/tape
 	t.true(typeof unzip === 'function', 'unzip is a Function');
+	t.deepEqual(unzip([['a', 1, true], ['b', 2, false]]), [['a', 'b'], [1, 2], [true, false]], `unzip([['a', 1, true], ['b', 2, false]]) equals [['a', 'b'], [1, 2], [true, false]]`);
+  t.deepEqual(unzip([['a', 1, true], ['b', 2]]), [['a', 'b'], [1, 2], [true]], `unzip([['a', 1, true], ['b', 2]]) equals [['a', 'b'], [1, 2], [true]]`);
 	//t.deepEqual(unzip(args..), 'Expected');
 	//t.equal(unzip(args..), 'Expected');
 	//t.false(unzip(args..), 'Expected');
 	//t.throws(unzip(args..), 'Expected');
 	t.end();
-});
\ No newline at end of file
+});
diff --git a/test/unzipWith/unzipWith.test.js b/test/unzipWith/unzipWith.test.js
index 09f3d2429..8c3cbea6a 100644
--- a/test/unzipWith/unzipWith.test.js
+++ b/test/unzipWith/unzipWith.test.js
@@ -5,9 +5,9 @@ test('Testing unzipWith', (t) => {
 	//For more information on all the methods supported by tape
 	//Please go to https://github.com/substack/tape
 	t.true(typeof unzipWith === 'function', 'unzipWith is a Function');
-	//t.deepEqual(unzipWith(args..), 'Expected');
+	t.deepEqual(unzipWith([[1, 10, 100], [2, 20, 200]], (...args) => args.reduce((acc, v) => acc + v, 0)), [3, 30, 300], `unzipWith([[1, 10, 100], [2, 20, 200]], (...args) => args.reduce((acc, v) => acc + v, 0)) equals [3, 30, 300]`);
 	//t.equal(unzipWith(args..), 'Expected');
 	//t.false(unzipWith(args..), 'Expected');
 	//t.throws(unzipWith(args..), 'Expected');
 	t.end();
-});
\ No newline at end of file
+});
diff --git a/test/xProd/xProd.js b/test/xProd/xProd.js
index 07ea52dfa..37b3556a6 100644
--- a/test/xProd/xProd.js
+++ b/test/xProd/xProd.js
@@ -1,2 +1,2 @@
-const xProd = (a, b) => a.map(x => b.map(y => [x, y]));
+const xProd = (a, b) => a.reduce((acc,x) => acc.concat(b.map(y => [x, y])),[]);
 module.exports = xProd
\ No newline at end of file
diff --git a/test/xProd/xProd.test.js b/test/xProd/xProd.test.js
index a164210a2..9d650e65c 100644
--- a/test/xProd/xProd.test.js
+++ b/test/xProd/xProd.test.js
@@ -5,9 +5,10 @@ test('Testing xProd', (t) => {
 	//For more information on all the methods supported by tape
 	//Please go to https://github.com/substack/tape
 	t.true(typeof xProd === 'function', 'xProd is a Function');
+  t.deepEqual(xProd([1, 2], ['a', 'b']), [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']], `xProd([1, 2], ['a', 'b']) returns [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]`);
 	//t.deepEqual(xProd(args..), 'Expected');
 	//t.equal(xProd(args..), 'Expected');
 	//t.false(xProd(args..), 'Expected');
 	//t.throws(xProd(args..), 'Expected');
 	t.end();
-});
\ No newline at end of file
+});