diff --git a/js/tests/average.json b/js/tests/average.json
new file mode 100644
index 000000000..a2896be11
--- /dev/null
+++ b/js/tests/average.json
@@ -0,0 +1,30 @@
+[
+  {
+    "description": "basic with a single value",
+    "code": "equal(average([12]), 12)"
+  },
+  {
+    "description": "basic with multiple values",
+    "code": "equal(average([1, 1, 4]), 2)"
+  },
+  {
+    "description": "Test with negative numbers",
+    "code": "equal(average([6, 3, -3]), 2)"
+  },
+  {
+    "description": "Test with a bigger array",
+    "code": "equal(average([1, 4, 8, 12]), 6.25)"
+  },
+  {
+    "description": "Test with 0 values",
+    "code": "equal(average([]), NaN)"
+  },
+  {
+    "description": "Test with a negative result",
+    "code": "equal(average([-12, 2, -32]), -14)"
+  },
+  {
+    "description": "Anti Cheesing",
+    "code": "if (/[1-9]/.test(average)) {\n  throw Error('You should not need numbers from 1 to 9')\n}"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/count-from-10.json b/js/tests/count-from-10.json
new file mode 100644
index 000000000..5f945a38c
--- /dev/null
+++ b/js/tests/count-from-10.json
@@ -0,0 +1,22 @@
+[
+  {
+    "description": "Count up to 12",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\nfrom10(12)\nequal(\n  args.flat().join('\\n'),\n  `10\n11\n12`,\n)"
+  },
+  {
+    "description": "Count up to 17",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\nfrom10(17)\nequal(\n  args.flat().join('\\n'),\n  `10\n11\n12\n13\n14\n15\n16\n17`,\n)"
+  },
+  {
+    "description": "Count down to 7",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\nfrom10(7)\nequal(\n  args.flat().join('\\n'),\n  `10\n9\n8\n7`,\n)"
+  },
+  {
+    "description": "Count down to 3",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\nfrom10(-3)\nequal(\n  args.flat().join('\\n'),\n  `10\n9\n8\n7\n6\n5\n4\n3\n2\n1\n0\n-1\n-2\n-3`,\n)"
+  },
+  {
+    "description": "Count to 10",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\nfrom10(10)\nequal(args.flat().join('\\n'), '10')"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/extremes.json b/js/tests/extremes.json
new file mode 100644
index 000000000..9a2cd8704
--- /dev/null
+++ b/js/tests/extremes.json
@@ -0,0 +1,30 @@
+[
+  {
+    "description": "Test 1",
+    "code": "equal(extreme([-1, 0, 10, 5]), { bigest: 10, smallest: -1 })"
+  },
+  {
+    "description": "Test 2",
+    "code": "equal(extreme([22, 7, 32, 99, 54]), { bigest: 99, smallest: 7 })"
+  },
+  {
+    "description": "Test 3",
+    "code": "equal(extreme([-5, -22, -7, -32, -99, -54]), { bigest: -5, smallest: -99 })"
+  },
+  {
+    "description": "Test 4",
+    "code": "equal(extreme([-5, Infinity, -Infinity, -32, -99, -54]), {\n  bigest: Infinity,\n  smallest: -Infinity,\n})"
+  },
+  {
+    "description": "Test 5",
+    "code": "equal(extreme([1337]), { bigest: 1337, smallest: 1337 })"
+  },
+  {
+    "description": "Test 6",
+    "code": "equal(extreme([Infinity]), { bigest: Infinity, smallest: Infinity })"
+  },
+  {
+    "description": "Anti Cheesing",
+    "code": "if (/[0-9]/.test(extreme)) {\n  throw Error('You should not need numbers')\n}"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/fikbuk.json b/js/tests/fikbuk.json
new file mode 100644
index 000000000..3491c6aea
--- /dev/null
+++ b/js/tests/fikbuk.json
@@ -0,0 +1,22 @@
+[
+  {
+    "description": "fikBuk until 3",
+    "code": "equal(fikBuk(3), [1, 2, 'Fik'])"
+  },
+  {
+    "description": "fikBuk until 5",
+    "code": "equal(fikBuk(5), [1, 2, 'Fik', 4, 'Buk'])"
+  },
+  {
+    "description": "fikBuk until 20",
+    "code": "equal(fikBuk(20), [\n  1,\n  2,\n  'Fik',\n  4,\n  'Buk',\n  'Fik',\n  7,\n  8,\n  'Fik',\n  'Buk',\n  11,\n  'Fik',\n  13,\n  14,\n  'FikBuk',\n  16,\n  17,\n  'Fik',\n  19,\n  'Buk',\n])"
+  },
+  {
+    "description": "fikBuk until 10000",
+    "code": "equal(fikBuk(10000).slice(9990), [\n  9991,\n  9992,\n  'Fik',\n  9994,\n  'Buk',\n  'Fik',\n  9997,\n  9998,\n  'Fik',\n  'Buk',\n])"
+  },
+  {
+    "description": "Anti Cheesing",
+    "code": "if (/(0|2|4|[6-9])/.test(fikBuk)) {\n  throw Error('You should only need numbers 3, 5 and maybe 1')\n}"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/funfunfunction.json b/js/tests/funfunfunction.json
new file mode 100644
index 000000000..b0765ba1a
--- /dev/null
+++ b/js/tests/funfunfunction.json
@@ -0,0 +1,6 @@
+[
+  {
+    "description": "exec execute the given function",
+    "code": "let count = 0\nexec(() => {})\nexec(() => count++)\nexec(() => {})\nexec(() => count++)\nequal(count, 2)"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/give-back.json b/js/tests/give-back.json
new file mode 100644
index 000000000..036edce97
--- /dev/null
+++ b/js/tests/give-back.json
@@ -0,0 +1,22 @@
+[
+  {
+    "description": "giveBack is declared and is a function",
+    "code": "equal(typeof giveBack, 'function')"
+  },
+  {
+    "description": "calling giveBack return a function",
+    "code": "equal(typeof giveBack(), 'function')"
+  },
+  {
+    "description": "giveBack works with numbers",
+    "code": "equal(giveBack(5)(), 5)"
+  },
+  {
+    "description": "giveBack works with strings",
+    "code": "equal(giveBack('hello')(), 'hello')"
+  },
+  {
+    "description": "giveBack works with undefined",
+    "code": "equal(giveBack()(), undefined)"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/go-to-11.json b/js/tests/go-to-11.json
new file mode 100644
index 000000000..5b4eaa700
--- /dev/null
+++ b/js/tests/go-to-11.json
@@ -0,0 +1,14 @@
+[
+  {
+    "description": "Count from 0 to 11",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\ngoTo11(0)\n\nequal(\n  args.flat().join('\\n'),\n  `0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11`,\n)"
+  },
+  {
+    "description": "Count from 0 to 11",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\n\ngoTo11(10)\n\nequal(\n  args.flat().join('\\n'),\n  `10\n11`,\n)"
+  },
+  {
+    "description": "Count from 12 to 11 (do nothing)",
+    "code": "const args = saveArguments(console, 'log')\n\n// Your code\ngoTo11(12)\n\nequal(args.flat().join('\\n'), ``)"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/olympic.json b/js/tests/olympic.json
new file mode 100644
index 000000000..d856bf209
--- /dev/null
+++ b/js/tests/olympic.json
@@ -0,0 +1,22 @@
+[
+  {
+    "description": "Should log the gold medal if the Pedro is ranked 1st",
+    "code": "let athletes = ['Pedro', 'Janine', 'Patrick', 'Bernadette', 'Maria']\nconst args = saveArguments(console, 'log')\n\n// Your code\n\nequal(args.flat(), ['🥇'])"
+  },
+  {
+    "description": "Should log the silver medal if the Pedro is ranked 2nd",
+    "code": "let athletes = ['Janine', 'Pedro', 'Patrick', 'Bernadette', 'Maria']\nconst args = saveArguments(console, 'log')\n\n// Your code\n\nequal(args.flat(), ['🥈'])"
+  },
+  {
+    "description": "Should log the bronze medal if the Pedro is ranked 3rd",
+    "code": "let athletes = ['Maria', 'Janine', 'Pedro', 'Bernadette', 'Patrick']\nconst args = saveArguments(console, 'log')\n\n// Your code\n\nequal(args.flat(), ['🥉'])"
+  },
+  {
+    "description": "Should log 😞 if Pedro is 4th place or more",
+    "code": "let athletes = ['Maria', 'Janine', 'Bernadette', 'Patrick', 'Pedro']\nconst args = saveArguments(console, 'log')\n\n// Your code\n\nequal(args[0]?.join(' '), '😞 Pedro is #5')"
+  },
+  {
+    "description": "Should log 😞 if Pedro is 4th place or more",
+    "code": "let athletes = [\n  'Maria',\n  'Martin',\n  'Janine',\n  'Bernadette',\n  'Jeremy',\n  'Sabrina',\n  'Kilian',\n  'Patrick',\n  'Pedro',\n  'Seb',\n]\nconst args = saveArguments(console, 'log')\n\n// Your code\n\nequal(args[0]?.join(' '), '😞 Pedro is #9')"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/power-ranger.json b/js/tests/power-ranger.json
new file mode 100644
index 000000000..aaceee969
--- /dev/null
+++ b/js/tests/power-ranger.json
@@ -0,0 +1,26 @@
+[
+  {
+    "description": "from 0 to 5",
+    "code": "equal(range(0, 5), [0, 1, 2, 3, 4])"
+  },
+  {
+    "description": "from 5 to 0",
+    "code": "equal(range(5, 0), [5, 4, 3, 2, 1])"
+  },
+  {
+    "description": "from -1 to -3",
+    "code": "equal(range(-1, -3), [-1, -2])"
+  },
+  {
+    "description": "from 2 to -3",
+    "code": "equal(range(10, 7), [10, 9, 8])"
+  },
+  {
+    "description": "if the end is equal to the start, return an empty array",
+    "code": "equal(range(5, 5), [])"
+  },
+  {
+    "description": "Anti Cheesing",
+    "code": "if (/[2-9]/.test(range)) {\n  throw Error('You should not use number from 2 to 9')\n}"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/total.json b/js/tests/total.json
new file mode 100644
index 000000000..ff24b9ae4
--- /dev/null
+++ b/js/tests/total.json
@@ -0,0 +1,30 @@
+[
+  {
+    "description": "basic with a single value",
+    "code": "equal(total([12]), 12)"
+  },
+  {
+    "description": "basic with multiple values",
+    "code": "equal(total([1, 1, 3]), 5)"
+  },
+  {
+    "description": "Test with negative numbers",
+    "code": "equal(total([6, 2, -3]), 5)"
+  },
+  {
+    "description": "Test with a bigger array",
+    "code": "equal(total([1, 2, 2, 8, 12]), 25)"
+  },
+  {
+    "description": "Test with 0 values",
+    "code": "equal(total([]), 0)"
+  },
+  {
+    "description": "Test with a negative result",
+    "code": "equal(total([-12, 2, -32]), -42)"
+  },
+  {
+    "description": "Anti Cheesing",
+    "code": "if (/[1-9]/.test(total)) {\n  throw Error('You should not need numbers from 1 to 9')\n}"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/ultra-venom-speed-control-system-rgb.json b/js/tests/ultra-venom-speed-control-system-rgb.json
new file mode 100644
index 000000000..3bb64a0ed
--- /dev/null
+++ b/js/tests/ultra-venom-speed-control-system-rgb.json
@@ -0,0 +1,18 @@
+[
+  {
+    "description": "If the temperature is above 90 expect 3200 RPM",
+    "code": "let temperature = 99\n\n// Your code\n\nequal(fanSpeed, 3200)"
+  },
+  {
+    "description": "If the temperature is above 90 expect 3200 RPM",
+    "code": "let temperature = 75\n\n// Your code\n\nequal(fanSpeed, 1600)"
+  },
+  {
+    "description": "If the temperature is above 40 expect 800 RPM",
+    "code": "let temperature = 62\n\n// Your code\n\nequal(fanSpeed, 800)"
+  },
+  {
+    "description": "If the temperature is below 40 expect 0 RPM",
+    "code": "let temperature = 32\n\n// Your code\n\nequal(fanSpeed, 0)"
+  }
+]
\ No newline at end of file
diff --git a/js/tests/what-9000.json b/js/tests/what-9000.json
new file mode 100644
index 000000000..114eb4457
--- /dev/null
+++ b/js/tests/what-9000.json
@@ -0,0 +1,18 @@
+[
+  {
+    "description": "powerlevel is defined and is a constant number",
+    "code": "let name = 'Patrick'\n\n// Your code\n\nequal(typeof powerlevel, 'number')"
+  },
+  {
+    "description": "powerlevel is a constant variable and can not be changed",
+    "code": "let name = 'Patrick'\n\n// Your code\ntry {\n  var previousValue = powerlevel\n  powerlevel = Math.random()\n} catch (err) {}\n\nequal(powerlevel, previousValue)"
+  },
+  {
+    "description": "Vegeta can not have more than 9000 powerlevel",
+    "code": "let name = 'Vegeta'\n\n// Your code\n\nequal(powerlevel <= 9000, true)"
+  },
+  {
+    "description": "Goku have more than 9000 powerlevel",
+    "code": "let name = 'Goku'\n\n// Your code\n\nequal(powerlevel > 9000, true)"
+  }
+]
\ No newline at end of file
diff --git a/subjects/average/README.md b/subjects/average/README.md
new file mode 100644
index 000000000..65af611af
--- /dev/null
+++ b/subjects/average/README.md
@@ -0,0 +1,15 @@
+## Average
+
+### Instructions
+
+Declare the function `average` that compute the average of all the values from
+the given array
+
+If the array is empty, `average` should return `NaN`
+
+**Example:**
+
+```js
+average([1, 1, 4]) // -> 2
+average([1, 4, 8, 12]) // -> 6.25
+```
diff --git a/subjects/count-from-10/README.md b/subjects/count-from-10/README.md
new file mode 100644
index 000000000..e11bde07a
--- /dev/null
+++ b/subjects/count-from-10/README.md
@@ -0,0 +1,15 @@
+## Count from 10
+
+### Instructions
+
+Declare `from10` function that takes an `end` number argument.
+
+You must log each number starting at `10` until you reach the `end` value
+(included)
+
+If the number is lower than `10` you must count down to it, otherwhise count up
+to it.
+
+> Example: `from10(12)` would log: 10 11 12
+>
+> and `from10(7)` would log: 10 9 8 7
diff --git a/subjects/diamon/README.md b/subjects/diamon/README.md
new file mode 100644
index 000000000..c6e916684
--- /dev/null
+++ b/subjects/diamon/README.md
@@ -0,0 +1,3 @@
+## 🌟 Diamon
+
+diamon (pyramid + reversed pyramid)
diff --git a/subjects/fikbuk/README.md b/subjects/fikbuk/README.md
new file mode 100644
index 000000000..bc9f88f16
--- /dev/null
+++ b/subjects/fikbuk/README.md
@@ -0,0 +1,23 @@
+## FikBuk
+
+### Instructions
+
+Create a `fikBuk` function that takes a number `n` and will start counting from
+`1` to `n`.
+
+You will return create an array from those values
+
+for each numbers in between `1` and `n` you must do the following:
+
+- if the number is a multiple of `3` add `Fik` to the array
+- if the number is a multiple of `5` add `Buk` to the array
+- if the number is a multiple of both `3` and `5` add `FikBuk` to the array
+- otherwise add the number to the array
+
+**Example:**
+
+```js
+fikBuk(3) // -> [1, 2, 'Fik']
+fikBuk(5) // -> [1, 2, 'Fik', 4, 'Buk']
+fikBuk(16) // -> [...7, 8, 'Fik', 'Buk', 11, 'Fik', 13, 14, 'FikBuk', 16]
+```
diff --git a/subjects/funfunfunction/README.md b/subjects/funfunfunction/README.md
new file mode 100644
index 000000000..221f54456
--- /dev/null
+++ b/subjects/funfunfunction/README.md
@@ -0,0 +1,15 @@
+## 🌟 FunFunFunction
+
+### Instruction
+
+Declare an `exec` function that takes a function and call it
+
+### Usage
+
+```js
+const showMessage = () => {
+  console.log('Functions inside a function ?!')
+}
+
+exec(showMessage) // log 'Functions inside a function ?!'
+```
diff --git a/subjects/give-back/README.md b/subjects/give-back/README.md
new file mode 100644
index 000000000..871d072c8
--- /dev/null
+++ b/subjects/give-back/README.md
@@ -0,0 +1,16 @@
+## 🌟 Give Back
+
+### Instruction
+
+Declare an `giveBack` function an argument and return a new function that when
+called will return the argument of the `giveBack` function
+
+### Usage
+
+```js
+const give5 = giveBack(5)
+const giveHello = giveBack('Hello')
+
+console.log(give5()) // 5
+console.log(giveHello()) // 'Hello'
+```
diff --git a/subjects/olympic/README.md b/subjects/olympic/README.md
new file mode 100644
index 000000000..62bf64875
--- /dev/null
+++ b/subjects/olympic/README.md
@@ -0,0 +1,20 @@
+## Olympic
+
+### Instructions
+
+The Olympic games just ended and you want to tell everyone about the ranking of
+your favorite athlete: Pedro.
+
+For the first to the third position, log the matching medal emoji 🥇🥈🥉.
+Otherwhise log this disapointed emoji: 😞 and a message of his exact ranking.
+
+Example, if pedro is in 10th place, the message to log would be:
+
+```js
+'😞 Pedro is #10'
+
+```
+
+### Notions
+
+- [indexOf](https://devdocs.io/javascript/global_objects/array/indexof)
diff --git a/subjects/power-ranger/README.md b/subjects/power-ranger/README.md
new file mode 100644
index 000000000..bd5a77cd8
--- /dev/null
+++ b/subjects/power-ranger/README.md
@@ -0,0 +1,18 @@
+## Power Ranger
+
+### Instructions
+
+Declare the `range` function that takes 2 number arguments: a `start` and an
+`end`.
+
+Create an array of numbers starting from the `start` (included) to the `end`
+(excluded).
+
+**Example:**
+
+```js
+range(0, 5) //-> [0, 1, 2, 3, 4]
+range(10, 7) //-> [10, 9, 8]
+range(2, -3) //-> [2, 1, 0, -1, -2]
+range(-1, -3) //-> [-1, -2]
+```
diff --git a/subjects/total/README.md b/subjects/total/README.md
new file mode 100644
index 000000000..723704b60
--- /dev/null
+++ b/subjects/total/README.md
@@ -0,0 +1,38 @@
+## Total
+
+JS also provide another type of loop than the `while`
+
+### for..of
+
+`for..of` loops are used to iterate _over_ a value, for example you can iterate
+over an array:
+
+```js
+let heroes = ['Superman', 'Batman', 'Onepuchman', 'Spiderman', 'Ultraman']
+
+// ↙ the for of  ↙  keywords
+for (let heroe of heroes) {
+  // <- the value we iterate over
+  //  ↖ variable declaration, will be each elements from the value
+  // in this case, heroes, an array
+  console.log(heroe)
+}
+```
+
+From the value we have used so far, only `string` and `array` are iterable.
+
+### Instructions
+
+Declare the function `total` that compute the sum of all the values from the
+given array
+
+If the array is empty, `total` should return 0
+
+**Example:**
+
+```js
+total([1, 1, 3]) // -> 5
+total([6, 2, -3]) // -> 5
+total([1, 2, 2]) // -> 5
+total([0, -2]) // -> -2
+```
diff --git a/subjects/ultra-venom-speed-control-system-rgb/README.md b/subjects/ultra-venom-speed-control-system-rgb/README.md
new file mode 100644
index 000000000..956cf8ec4
--- /dev/null
+++ b/subjects/ultra-venom-speed-control-system-rgb/README.md
@@ -0,0 +1,14 @@
+## 🌟 Ultra Venom Speed Control System (RGB)
+
+### Instruction
+
+You are writing the cooling controller of your new gaming PC. \
+Declare a constant variable `fanSpeed` of the RPM _(revolutions per minute)_ of your
+cooling fan.
+
+Check the provided variable `temperature` to define the `fanSpeed` value:
+
+- If the `temperature` is above `90` define it's value too `3200`
+- If the `temperature` is above `70` define it's value too `1600`
+- If the `temperature` is above `40` define it's value too `800`
+- otherwhise set it's value to `0`
diff --git a/subjects/what-9000/README.md b/subjects/what-9000/README.md
new file mode 100644
index 000000000..5bec1d209
--- /dev/null
+++ b/subjects/what-9000/README.md
@@ -0,0 +1,9 @@
+## 🌟 What 9000 ?!
+
+### Instructions
+
+Define the `powerlevel` constant variable from the provided `name` variable to a
+number of your choice.
+
+But, only if the name is `'Goku'` the powerlevel must be higher than, of course,
+`9000`.