diff --git a/03_recursion/01_countdown.js b/03_recursion/javascript/01_countdown.js
similarity index 100%
rename from 03_recursion/01_countdown.js
rename to 03_recursion/javascript/01_countdown.js
diff --git a/03_recursion/02_greet.js b/03_recursion/javascript/02_greet.js
similarity index 100%
rename from 03_recursion/02_greet.js
rename to 03_recursion/javascript/02_greet.js
diff --git a/03_recursion/03_factorial.js b/03_recursion/javascript/03_factorial.js
similarity index 100%
rename from 03_recursion/03_factorial.js
rename to 03_recursion/javascript/03_factorial.js
diff --git a/04_quicksort/01_loop_sum.js b/04_quicksort/01_loop_sum.js
deleted file mode 100644
index d2f70fd..0000000
--- a/04_quicksort/01_loop_sum.js
+++ /dev/null
@@ -1,11 +0,0 @@
-'use strict';
-
-function sum(arr) {
-  let total = 0;
-  for (let x = 0; x < arr.length; x++) {
-    total += arr[x];
-  }
-  return total;
-}
-
-console.log(sum([1, 2, 3, 4])) // 10
diff --git a/04_quicksort/02_recursive_sum.js b/04_quicksort/02_recursive_sum.js
deleted file mode 100644
index b0712f2..0000000
--- a/04_quicksort/02_recursive_sum.js
+++ /dev/null
@@ -1,10 +0,0 @@
-'use strict';
-
-function sum(list) {
-  if (list.length === 0) {
-    return 0;
-  }
-  return list[0] + sum(list.slice(1));
-}
-
-console.log(sum([1, 2, 3, 4])) // 10
diff --git a/04_quicksort/03_recursive_count.js b/04_quicksort/03_recursive_count.js
deleted file mode 100644
index 139acfc..0000000
--- a/04_quicksort/03_recursive_count.js
+++ /dev/null
@@ -1,10 +0,0 @@
-'use strict';
-
-function count(list) {
-  if (list.length === 0) {
-    return 0;
-  }
-  return 1 + count(list.slice(1));
-}
-
-console.log(count([0, 1, 2, 3, 4, 5])); // 6
diff --git a/04_quicksort/04_recursive_max.js b/04_quicksort/04_recursive_max.js
deleted file mode 100644
index fe457e9..0000000
--- a/04_quicksort/04_recursive_max.js
+++ /dev/null
@@ -1,11 +0,0 @@
-'use strict';
-
-function max(list) {
-  if (list.length === 2) {
-    return list[0] > list[1] ? list[0] : list[1];
-  }
-  let sub_max = max(list.slice(1));
-  return list[0] > sub_max ? list[0] : sub_max;
-}
-
-console.log(max([1, 5, 10, 25, 16, 1])); // 25
diff --git a/04_quicksort/05_quicksort.js b/04_quicksort/05_quicksort.js
deleted file mode 100644
index c3c61ae..0000000
--- a/04_quicksort/05_quicksort.js
+++ /dev/null
@@ -1,18 +0,0 @@
-'use strict';
-
-function quicksort(array) {
-  if (array.length < 2) {
-    // base case, arrays with 0 or 1 element are already "sorted"
-    return array;
-  } else {
-   // recursive case
-   let pivot = array[0];
-   // sub-array of all the elements less than the pivot
-   let less = array.slice(1).filter(function(el) { return el <= pivot; });
-   // sub-array of all the elements greater than the pivot
-   let greater = array.slice(1).filter(function(el) { return el > pivot; });
-   return quicksort(less).concat([pivot], quicksort(greater));
-  }
-}
-
-console.log(quicksort([10, 5, 2, 3])); // [2, 3, 5, 10]
diff --git a/05_hash_tables/01_price_of_groceries.js b/05_hash_tables/01_price_of_groceries.js
deleted file mode 100644
index a95d3d2..0000000
--- a/05_hash_tables/01_price_of_groceries.js
+++ /dev/null
@@ -1,10 +0,0 @@
-'use strict';
-
-const book = {};
-// an apple costs 67 cents
-book['apple'] = 0.67;
-// milk costs $1.49
-book['milk'] = 1.49;
-book['avocado'] = 1.49;
-
-console.log(book); // { apple: 0.67, milk: 1.49, avocado: 1.49 }
diff --git a/05_hash_tables/02_check_voter.js b/05_hash_tables/02_check_voter.js
deleted file mode 100644
index 288eba6..0000000
--- a/05_hash_tables/02_check_voter.js
+++ /dev/null
@@ -1,16 +0,0 @@
-'use strict';
-
-const voted = {};
-function check_voter(name) {
-  if (voted[name]) {
-    console.log('kick them out!');
-  } else {
-    voted[name] = true;
-    console.log('let them vote!');
-  }
-}
-
-
-check_voter("tom"); // let them vote!
-check_voter("mike"); // let them vote!
-check_voter("mike"); // kick them out!